Battery cell, battery device, and electric device

Abstract

The utility model discloses a battery monomer, battery device and electric device, battery monomer includes: shell subassembly, pole post subassembly, electrode subassembly, shell subassembly includes first wall, and first wall is equipped with mounting hole, pole post subassembly installs in mounting hole, and includes pole post body, first clamping piece, second clamping piece and insulation sealing structure, and first clamping piece is equipped in the one side of second clamping piece away from shell subassembly, and second clamping piece includes first part and second part, and first part connects first clamping piece, and second part is through the insulation sealing structure and first clamping piece and clamps the pole post body, in the thickness direction of first wall, the thickness of first part is greater than the thickness of second part, and second part is bent to the one side of approaching insulation sealing structure relative to first part, electrode subassembly is equipped in shell subassembly, and with pole post body electricity is connected. The utility model improves the structural strength of pole post subassembly and increases the compression of insulation sealing structure, to improve the reliability of battery monomer.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, battery devices, as the power source, play an irreplaceable and crucial role. Typically, a battery device consists of a casing and multiple battery cells housed within it. Currently, the reliability of individual battery cells needs further improvement. Utility Model Content

[0003] This application provides a battery cell, a battery device, and an electrical device, which can improve the insufficient compression of the insulation and sealing structure of the terminal assembly and the problem of the terminal assembly detaching from the housing assembly, thereby improving the reliability of the battery cell.

[0004] In a first aspect, embodiments of this application provide a battery cell, including: a housing assembly, a terminal assembly, and an electrode assembly. The housing assembly includes a first wall with a mounting hole; the terminal assembly is mounted in the mounting hole and includes a terminal body, a first clamping member, a second clamping member, and an insulating sealing structure. The first clamping member is located on the side of the second clamping member away from the housing assembly. The second clamping member includes a first part and a second part. The first part is connected to the first clamping member, and the second part clamps the terminal body with the first clamping member through the insulating sealing structure. In the thickness direction of the first wall, the thickness of the first part is greater than the thickness of the second part, and the second part is bent relative to the first part towards the side closer to the insulating sealing structure. The electrode assembly is disposed within the housing assembly and is electrically connected to the terminal body.

[0005] In the above technical solution, the first clamping member and the second clamping member constitute a connection structure connecting the electrode post body and the housing assembly. By configuring the second clamping member to include a first part and a second part, the first part is connected to the first clamping member, and the second part clamps the electrode post body with the first clamping member through an insulating and sealing structure. In the thickness direction of the first wall, the thickness of the first part is greater than the thickness of the second part, and the second part is bent relative to the first part towards the side closer to the insulating and sealing structure. This improves the structural strength and rigidity of the second clamping member, enhances the connection reliability between the electrode post body and the first wall, reduces the risk of the electrode post body detaching from the housing assembly under force, and thus improves the reliability of the battery cell. Moreover, since the second part of the second clamping member is bent relative to the first part towards the side closer to the insulating and sealing structure, this structure can also increase the compression of the insulating and sealing structure, thereby enhancing the insulation and sealing effect of the insulating and sealing structure on the electrode post body, and further improving the reliability of the battery cell.

[0006] In some embodiments of this application, in the thickness direction of the first wall, the thickness of the second portion is greater than half the thickness of the first portion.

[0007] In the above technical solution, the second part plays a crucial role in clamping the electrode body and cooperating with the insulating and sealing structure. Its greater thickness enhances the strength and rigidity of the second part, ensuring sufficient pressure is provided when clamping the electrode body, preventing deformation or damage to the battery cell under terrestrial forces. The thickness of the second and first parts, as described in the above solution, also helps to balance the size and weight of the second clamping component while maintaining high structural strength and rigidity. In other words, minimizing the size and weight of the second clamping component maximizes the energy density of the battery cell.

[0008] In some embodiments of this application, the first clamping member includes a horizontal arm, a vertical arm, and a clamping arm. The horizontal arm connects to the first part, the vertical arm connects the horizontal arm and the clamping arm, and the clamping arm clamps the pole body with the second part through an insulating and sealing structure. In the direction from the vertical arm to the pole body, the size of the horizontal arm is smaller than the minimum size of the first part.

[0009] In the above technical solution, the first clamping member with the above structure can improve the clamping reliability of the electrode body, and also improve the structural strength and rigidity of the first clamping member itself, reducing the risk of large deformation of the first clamping member when the electrode body is subjected to force, thereby improving the installation reliability of the electrode body. By making the dimension of the horizontal arm smaller than the minimum dimension of the first part in the direction of the vertical arm pointing towards the electrode body, it is beneficial to have a larger gap at the connection between the first part and the first wall and the connection between the horizontal arm and the first part. This can reduce the mutual influence between the connection positions of the first clamping member and the second clamping member during assembly, which is beneficial to improving the connection reliability of the first clamping member and the second clamping member, and thus also improving the overall reliability of the battery cell.

[0010] In some embodiments of this application, in the direction from the upright arm to the pole body, the minimum dimension of the first part is W1, and the dimension of the horizontal arm is W2, wherein 1.5mm≤W2≤W1≤2mm.

[0011] In the above technical solution, by setting the dimensions of the first part and the cross arm within the above range, the size and weight of the first part and the cross arm can be reduced while minimizing the impact between the connection between the first part and the first wall and the connection between the cross arm and the first part. This is beneficial to improving the structural compactness of the first clamping member and the second clamping member, reducing the size and weight of the electrode assembly, and thus improving the energy density of the battery cell.

[0012] In some embodiments of this application, the second clamping member has a first stepped portion bent on the side away from the first clamping member. In the above technical solution, the first stepped portion can strengthen the second clamping member, and can be provided with ribs or concave ribs as in sheet metal, thereby improving the structural strength and rigidity of the second clamping member. On the other hand, the first stepped portion can also better disperse stress, prevent the second clamping member from deforming, thereby ensuring the stability of the terminal assembly, ensuring that the terminal body will not loosen or shift due to the deformation of the second clamping member, and ensuring the normal operation of the battery device.

[0013] In some embodiments of this application, the first portion has an inner side facing into the housing assembly, and the first step portion has a transition surface connecting the first portion and the second portion, with the transition surface and the inner side facing at an angle.

[0014] In the above technical solution, the inner surface and the transition surface can be straight. The first step with the above structure is simple in structure, easy to process and manufacture, which can reduce manufacturing difficulty and improve product yield.

[0015] In some embodiments of this application, an angle θ is formed between the transition surface and the inner surface, wherein 90 degrees ≤ θ ≤ 180 degrees.

[0016] In the above technical solution, within this angle range, a relatively large angle change area is formed between the transition surface and the inner surface. This increases the selectable range of the effective included angle between the transition surface and the inner surface during manufacturing, reducing manufacturing difficulty. The above solution also enhances the strength reinforcement effect of the first step on the second clamping component, giving the second clamping component higher structural strength and rigidity. When the battery is subjected to external forces, such as vibration or impact, this angle setting helps to distribute the external force over a larger area, avoiding stress concentration at a localized location on the second clamping component, thereby ensuring that the root of the second clamping component meets the required rigidity requirements.

[0017] In some embodiments of this application, the first clamping member includes a horizontal arm, a vertical arm, and a clamping arm. The horizontal arm connects to the first part, the vertical arm is perpendicular to the horizontal arm and the clamping arm, the clamping arm is parallel to the first wall, and the clamping arm and the second part clamp the pole body through an insulating and sealing structure. The first step is provided on the side of the vertical arm near the pole body.

[0018] In the above technical solution, when the electrode body is subjected to force, the bending and torsional action points transmitted to the second clamping member are concentrated on the side of the second clamping member away from the electrode body. Therefore, by setting the first step part on the side of the upright arm close to the electrode body, the strength amplification effect of the first step part on the second clamping member can be greater on the first part, which can play a better reinforcing role, reduce the risk of bending deformation of the second clamping member when subjected to force, and help to further improve the reliability of the battery cell.

[0019] In some embodiments of this application, the height of the first step portion in the thickness direction of the first wall is H, wherein 0.1mm≤H≤0.4mm.

[0020] In the above technical solution, by setting the height of the first step within the aforementioned range, the first step can achieve a high strength enhancement effect. When the pole body is subjected to external force, the deformation of the first and second parts can be reduced, thereby preventing the pole body from loosening due to deformation of the clamping parts. Simultaneously, a height difference range of 0.1mm ≤ H ≤ 0.4mm places relatively moderate requirements on the manufacturing process; it avoids significantly increasing processing difficulty due to an excessively small height difference, while also preventing excessive material costs and space occupation due to an excessively large height difference.

[0021] In some embodiments of this application, the first part includes a first segment and a second segment connected together, the first segment being connected to a first wall, and the thickness of the first segment being greater than the thickness of the second segment, and the second segment being connected to the second part.

[0022] In the above technical solution, the first section connects to the first wall and has a relatively large thickness, providing sufficient strength to withstand the forces from the first wall and the external environment, preventing damage or deformation at the connection between the first part and the first wall. The second section, with a smaller thickness, connects to the second part, ensuring strong connection with the second part while reducing the overall weight, avoiding material waste, and thus saving costs.

[0023] In some embodiments of this application, a protrusion is provided on the inner side of the mounting hole, and a second step is provided in the first section, the second step cooperating with the protrusion.

[0024] In the above technical solution, the cooperation between the second stepped portion and the protruding portion provides a precise positioning reference for the installation of the second clamping member at the mounting hole. During assembly, this ensures that the second clamping member is accurately installed in the predetermined position, reducing assembly errors and improving assembly efficiency. Simultaneously, the second stepped portion and the protruding portion can support each other, sharing the external force under load and avoiding localized stress concentration, thereby improving the deformation resistance and load-bearing capacity of the connection between the protruding portion and the second stepped portion.

[0025] In some embodiments of this application, the thickness of the second section and the thickness of the second part remain equal in the direction from which the first clamping member points to the electrode body. In the above technical solution, when the electrode body is subjected to external forces (such as vibration or impact), the uniform thickness ensures a more uniform stress distribution in the second section and the second part under stress. This prevents stress concentration due to local thickness differences, thereby enhancing the structural stability and mechanical strength of the second clamping member, reducing the risk of deformation and damage, and improving the reliability of the electrode assembly and the battery cell.

[0026] In some embodiments of this application, the first segment and the second segment have grooves formed on the side facing the first clamping member, and the first clamping member is disposed in the grooves.

[0027] In the above technical solution, the groove provides precise positioning and installation space for the first clamping component, enabling it to be accurately placed in the predetermined position during installation and reducing assembly errors. Simultaneously, with the first clamping component embedded in the groove, when the terminal post body is subjected to external force, stress can be transmitted more evenly through the contact area between the first and second clamping components, reducing the risk of component damage due to localized stress concentration. This enhances the mechanical strength and durability of the terminal post assembly and extends the service life of the battery cells.

[0028] In some embodiments of this application, the first clamping member includes a horizontal arm, a vertical arm, and a clamping arm. The horizontal arm connects to the first part, the vertical arm connects the horizontal arm and the clamping arm, the clamping arm is parallel to the first wall, and the clamping arm and the second part clamp the electrode body through an insulating sealing structure. The horizontal arm is disposed in a groove and has a first outer side away from the electrode assembly. The first section has a second outer side away from the electrode assembly, and the second outer side and the first outer side are coplanar.

[0029] In the above technical solution, the second outer side and the first outer side are coplanar, which is beneficial to the connection of the cross arm and the second clamping member, which is beneficial to improving the connection reliability. It can also reduce the risk of protruding structures on the outside of the electrode assembly, reduce the risk of interference when the electrode assembly is connected to other external conductive parts, and also help to reduce the size and weight of the electrode assembly and increase the energy density of the battery cell.

[0030] In some embodiments of this application, the second clamping member includes a third portion connected to the side of the second portion away from the electrode assembly. In the above technical solution, the third portion can better cooperate with the insulating sealing structure, further increasing the compression of the insulating sealing structure, thereby further enhancing the insulation and sealing effect of the electrode post body.

[0031] In some embodiments of this application, the third portion is located at the end of the second portion away from the first portion and is set at an angle to the second portion.

[0032] In the above technical solution, the angle setting can change the force transmission path, more effectively disperse stress, prevent the second part from deforming or being damaged due to force concentration, and thus help maintain the stability of the terminal assembly, ensure the firm installation of the terminal body, and ensure the reliability of the internal electrical connection of the battery cell. At the same time, the third part can solve the problem of insufficient compression of the insulation and sealing structure of the terminal assembly.

[0033] In some embodiments of this application, the third portion is perpendicular to the second segment. In the above technical solution, the vertical structure allows the third portion and the second segment to form a stable "L"-shaped structure. This vertical connection effectively disperses stress, enhances the overall rigidity of the second clamping member, and prevents structural deformation. The above structure also allows the third portion to exert positive pressure on the insulating sealing structure, which is beneficial for the insulating sealing structure to have a greater compression capacity, improving insulation and sealing reliability.

[0034] In some embodiments of this application, the insulating sealing structure includes a seal and a first insulating member, the seal being disposed between the pole body and the second clamping member, and the first insulating member being disposed between the pole body and the first clamping member.

[0035] In the above technical solution, the sealing element improves the sealing performance between the terminal body and the second clamping element, reducing the risk of electrolyte leakage inside the housing assembly and decreasing the probability of external moisture, dust, and other particulate matter entering the housing assembly, thus improving the reliability of the battery cell. The first insulating element provides an insulated connection between the first clamping element and the terminal body, reducing the risk of short circuits between them. It also provides a certain degree of sealing between the first clamping element and the terminal body, enhancing the sealing performance and thereby improving the reliability of the terminal assembly, and consequently, the reliability of the battery cell.

[0036] In some embodiments of this application, the insulating sealing structure includes a second insulating member disposed on the outer side of the first clamping member away from the pole body and connected to the first insulating member.

[0037] In the above technical solution, the second insulating component connects to the first insulating component and covers the outer surface of the first clamping component away from the terminal body, further expanding the insulation area and forming a more comprehensive insulating protective layer. This not only prevents leakage between the terminal body and the first clamping component but also avoids potential electrical conduction between the outer surface of the first clamping component and other surrounding components, effectively improving the insulation performance of the battery cell, reducing the risk of leakage, and increasing the reliability of the battery cell. The connection between the second and first insulating components also forms a continuous insulating barrier and increases the insulation boundary, enhancing the insulation performance between the terminal body and the first clamping component, thereby improving the reliability of the terminal assembly and ultimately the reliability of the battery cell.

[0038] In some embodiments of this application, the first insulating member and the second insulating member are integrally formed. This integrally formed structural design helps reduce the number of parts, thereby reducing assembly steps, simplifying the production process, and lowering manufacturing costs.

[0039] In some embodiments of this application, the insulating sealing structure includes a third insulating member disposed on the side of the second clamping member near the electrode assembly, and the third insulating member abuts against the sealing member.

[0040] In the above technical solution, the third insulating component is disposed on the side of the second clamping component near the electrode assembly, further expanding the insulation area and effectively isolating the electrical connection between the electrode assembly and the second clamping component. The third insulating component abuts against the sealing component, forming a more complete insulation barrier, preventing current leakage to the second clamping component, avoiding potential short circuits and leakage risks, and improving the reliability of the battery cell.

[0041] In some embodiments of this application, the battery cell includes an insulating component disposed inside the first wall and abutting or connecting to a third insulating component. In the above technical solution, the insulating component is installed inside the first wall and connected to or abutting the third insulating component, providing additional support for internal structures such as the terminal assembly and electrode assembly. The abutting or connection between the insulating component and the third insulating component forms a more complete and continuous insulation system, thereby expanding the insulation range and reducing the risk of short circuits caused by electrical contact between the electrode assembly and the first wall.

[0042] In some embodiments of this application, the housing assembly includes a housing and a cover plate. One end of the housing has an opening, and the cover plate covers the opening. A first wall is disposed on the housing or the cover plate. In the above technical solution, the housing and the cover plate together constitute a relatively enclosed space, which can effectively protect the internal components of the battery cell from external physical impacts, dust, moisture, and corrosive substances, reduce the risk of damage to internal components, extend the service life of the battery cell, and thus ensure the stability and reliability of the battery cell performance. The above solution also provides more options for the installation of the terminal assembly, thereby expanding the structural forms of the battery cell and helping to meet different design requirements.

[0043] In some embodiments of this application, a protruding structure is formed by bending on the first wall, and the protruding structure is arranged around the mounting hole. In the above technical solution, the protruding structure can play a role in strengthening the first wall, improving the structural strength and rigidity of the first wall, better withstanding the force from the electrode body, reducing the risk of deformation of the first wall, and thus improving the reliability of the battery cell.

[0044] In some embodiments of this application, the first clamping member and the second clamping member are insulated and sealed to the mounting hole, and the second clamping member is bent to form a protruding structure that surrounds the mounting hole.

[0045] In the above technical solution, the protruding structure can strengthen the second clamping member, improve the structural strength and rigidity of the second clamping member 123, so that it can better withstand the force from the electrode body, reduce the risk of large deformation of the second clamping member, and reduce the probability of the electrode body detaching from the first clamping member and the second clamping member. It can also reduce the probability of insufficient compression of the insulation and sealing structure, thereby improving the reliability of the electrode assembly and the reliability of the battery cell.

[0046] Secondly, embodiments of this application provide a battery device including a single battery cell as described above.

[0047] In the above technical solution, since the battery cell has high reliability, the battery device using the battery cell can have good reliability.

[0048] Thirdly, embodiments of this application provide an electrical device, including a single battery cell as described above, or a battery device as described above.

[0049] In the above technical solution, since the battery cell or battery device has high reliability, it is beneficial to improve the reliability of the electrical device that uses the battery cell or battery device. Attached Figure Description

[0050] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 The electrical device provided in some embodiments of this application is a structural schematic diagram of a vehicle;

[0052] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0053] Figure 3 This is a schematic diagram of the internal structure of a battery cell provided in some embodiments of this application;

[0054] Figure 4 This is a partial structural schematic diagram of a battery cell provided in some embodiments of this application;

[0055] Figure 5 for Figure 4 A magnified view of section II;

[0056] Figure 6This is a partial structural schematic diagram of the second clamping member provided in one embodiment of this application;

[0057] Figure 7 for Figure 3 A magnified view of part I;

[0058] Figure 8 For other embodiments of this application Figure 3 A schematic diagram of the structure at point I;

[0059] Figure 9 This is a schematic diagram of the structure of a battery cell according to other embodiments of this application;

[0060] Figure 10 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0061] Figure 11 for Figure 10 A schematic diagram of the first clamping component before and after manufacturing in the embodiment;

[0062] Figure 12 for Figure 10 A schematic diagram of the second clamping component before and after manufacturing in the embodiment;

[0063] Figure 13 This is a schematic diagram of the assembly process of a battery cell provided in some embodiments of this application.

[0064] icon:

[0065] 1000. Electrical appliances;

[0066] 100. Battery device;

[0067] 10. Battery cells;

[0068] 11. Housing assembly;

[0069] 111, First wall; 111a, Mounting hole;

[0070] 112. Outer shell; 112a. Opening;

[0071] 113. Cover plate;

[0072] 12. Pole post assembly;

[0073] 121. Pole column body; 12101. First material part; 12101. Second material part;

[0074] 122, First clamping member; 1221, Horizontal arm; 1221a, First outer surface; 1222, Vertical arm; 1223, Clamping arm; 1201, First material layer; 1202, Second material layer;

[0075] 123. Second clamping member; 1231. First part; 1231a. Inner surface; 12311. First section; 12312. Second section; 12313. Second step; 1231c. Groove; 1231d. Second outer surface; 1232. Second part; 1233. First step; 1233a. Transition surface; 1234. Third part; 1203. Third material layer; 1204. Fourth material layer;

[0076] 124. Insulating and sealing structure; 1241. Sealing element; 1242. First insulating element; 1243. Second insulating element; 1244. Third insulating element;

[0077] 13. Electrode assembly; 131. Electrode tab;

[0078] 14. Insulating components;

[0079] 15. Protruding structure;

[0080] 20. Box body; 21. First box body; 22. Second box body;

[0081] 200, controller; 300, motor; X, first direction; Z, third direction. Detailed Implementation

[0082] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0083] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0084] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0085] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0086] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0087] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0088] In this application, "multiple" means two or more (including two).

[0089] In this application, the battery cell may include lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, and the embodiments of this application are not limited to these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0090] The battery apparatus mentioned in the embodiments of this application can refer to an assembly of one or more battery cells for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar. In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0091] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0092] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing. As an example, the individual battery cell assembly may be a battery module, which can be housed within the housing by securing the battery module to the housing. Alternatively, the individual battery cell assembly may be housed within the housing by directly securing multiple individual battery cells to the housing. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the individual battery cells.

[0093] A single battery cell includes a casing, electrode assembly, and electrolyte. The casing houses the electrode assembly and electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, while the uncoated positive current collector protrudes beyond the coated one, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the one with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0094] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0095] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, battery devices, as the power source, play an irreplaceable and crucial role. Typically, a battery device consists of a casing and multiple battery cells housed within it. Currently, the reliability of individual battery cells needs further improvement.

[0096] In a typical battery cell, the terminal assembly usually includes the terminal body, which is mounted to the casing via riveting, welding, or other methods. However, as the battery cell operates under prolonged charging and discharging, the internal gas pressure increases, creating an outward pulling force on the terminal body, posing a risk of the terminal body detaching from the casing. Secondly, the terminal body is usually welded to external conductive components (such as electrodes). During use, under the influence of these conductive components, the terminal body is also subjected to an outward pulling force, again posing a risk of detachment from the casing. In other words, the terminal body is at risk of detaching from the casing due to significant stress during use, thus affecting the reliability of the battery cell. Insufficient strength of the connection structure between the terminal body and the casing is one contributing factor to this problem. Furthermore, the periphery of the terminal body is typically sealed using a sealing structure, usually located between the upper or lower surface of the casing wall and the terminal body. Pre-applied pressure is used to compress the sealing structure between the terminal body and the casing wall to ensure sufficient compression. However, when the applied pre-force is removed and the electrode body becomes loose relative to the shell wall during subsequent use, the compression of the sealing structure will gradually decrease. Moreover, as analyzed above, the deformation of the connection structure between the electrode body and the shell can also easily cause a decrease in the compression of the sealing structure. All of the above factors will affect the sealing performance of the electrode body and the reliability of the battery cell.

[0097] Based on the above considerations, in order to address the risks of the battery cell's terminal body detaching from the casing due to insufficient strength of the connection structure between the terminal body and the casing, and the risk of insufficient compression in the terminal body's sealing structure, thus affecting the reliability of the battery cell, the applicant has designed a battery cell comprising: a casing assembly, a terminal assembly, and an electrode assembly. The casing assembly includes a first wall with mounting holes; the terminal assembly is mounted in the mounting holes and includes a terminal body, a first clamping member, a second clamping member, and an insulating sealing structure. The first clamping member is located on the side of the second clamping member away from the casing assembly. The second clamping member includes a first part and a second part. The first part is connected to the first clamping member, and the second part clamps the terminal body to the first clamping member through the insulating sealing structure. In the thickness direction of the first wall, the thickness of the first part is greater than the thickness of the second part, and the second part is bent relative to the first part towards the side closer to the insulating sealing structure. The electrode assembly is located inside the casing assembly and is electrically connected to the terminal body.

[0098] In this battery cell structure, the first clamping member and the second clamping member constitute a connection structure connecting the terminal body and the housing assembly. By configuring the second clamping member to include a first part and a second part, the first part connects to the first clamping member, and the second part clamps the terminal body to the first clamping member through an insulating and sealing structure. In the thickness direction of the first wall, the thickness of the first part is greater than the thickness of the second part, and the second part is bent relative to the first part towards the side closer to the insulating and sealing structure. This improves the structural strength and rigidity of the second clamping member, enhances the connection reliability between the terminal body and the first wall, reduces the risk of the terminal body detaching from the housing assembly under force, and thus improves the reliability of the battery cell. Moreover, since the second part of the second clamping member is bent relative to the first part towards the side closer to the insulating and sealing structure, this structure also increases the compression of the insulating and sealing structure, thereby enhancing the insulation and sealing effect of the insulating and sealing structure on the terminal body, and further improving the reliability of the battery cell.

[0099] The battery cells or battery devices disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system comprising the battery cells and battery devices disclosed in this application can be used to construct such an electrical device, thus expanding the applicability of the battery cells and battery devices.

[0100] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0101] For ease of explanation, the following embodiments use a vehicle as an example to illustrate an electrical device 1000 according to an embodiment of this application. Please refer to... Figure 1 , Figure 1 The electrical device 1000 provided in some embodiments of this application is a structural schematic diagram of a vehicle. The vehicle 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 100 is installed inside the vehicle, and the battery device 100 can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0102] In some embodiments of this application, the battery device can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0103] Please refer to Figure 2 The figure shows an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 20 and a plurality of battery cells 10, which are housed within the housing 20. The housing 20 provides assembly space for the battery cells 10, and the housing 20 can adopt various structures. In some embodiments, the housing 20 may include a first housing body 21 and a second housing body 22, which cover each other, and together define an assembly space for accommodating the battery cells 10. The second housing body 22 may be a hollow structure open at one end, and the first housing body 21 may be a plate-like structure, with the first housing body 21 covering the open side of the second housing body 22 so that the first housing body 21 and the second housing body 22 together define the assembly space; the first housing body 21 and the second housing body 22 may also be hollow structures both open on one side, with the open side of the first housing body 21 covering the open side of the second housing body 22. Of course, the box formed by the first box body 21 and the second box body 22 can be of various shapes, such as cylinder, cuboid, etc.

[0104] In the battery device 100, multiple battery cells 10 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 10 is housed within the housing 20. Alternatively, the battery device 100 can also consist of multiple battery cells 10 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 20. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 10.

[0105] Please refer to Figure 2 , Figure 2 The following is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes multiple rows of battery cells 10, which are arranged along the length of a housing 20. Each row of battery cells 10 includes multiple battery cells 10 arranged along the width of the housing 20; or, the multiple rows of battery cells 10 are arranged along the width of the housing 20, and each row of battery cells 10 includes multiple battery cells 10 arranged along the length of the housing 20.

[0106] Each battery cell 10 can be a secondary battery or a primary battery. A secondary battery refers to a battery cell that can be recharged after discharge to activate its active materials and continue to be used. It can also be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited in this regard. The battery cell can be cylindrical, flat, cuboid, or other shapes. For example, in... Figure 2 In the middle, the shape of the battery cell 10 is a cuboid.

[0107] Reference Figures 3 to 5This application provides a battery cell 10, including: a housing assembly 11, a terminal assembly 12, and an electrode assembly 13. The housing assembly 11 includes a first wall 111 with a mounting hole 111a. The electrode assembly 12 is mounted in the mounting hole 111a and includes an electrode body 121, a first clamping member 122, a second clamping member 123, and an insulating sealing structure 124. The first clamping member 122 is located on the side of the second clamping member 123 away from the housing assembly 11. The second clamping member 123 includes a first part 1231 and a second part 1232. The first part 1231 is connected to the first clamping member 122, and the second part 1232 clamps the electrode body 121 with the first clamping member 122 through the insulating sealing structure 124. In the thickness direction of the first wall 111, the thickness of the first part 1231 is greater than the thickness of the second part 1232. The second part 1232 is bent relative to the first part 1231 towards the side closer to the insulating sealing structure 124. The electrode assembly 13 is located inside the housing assembly 11 and is electrically connected to the electrode body 121.

[0108] The housing assembly 11 can refer to a structure used to house and protect the internal components of the battery cell 10. The shape of the housing assembly 11 can be, but is not limited to, a cuboid, a cube, a cylinder, etc., and the material can be, but is not limited to, metal materials (such as aluminum, stainless steel, etc.), plastic materials (such as polypropylene, polyamide, polyphenylene sulfide, etc.), composite materials (such as carbon fiber reinforced composite materials, aluminum-plastic film, etc.), or other materials resistant to electrolyte corrosion, etc.

[0109] The first wall 111 can refer to a shell wall among the plurality of shell walls that enclose the housing assembly 11, which has mounting holes 111a. For example, the housing assembly 11 can have a first direction X, a second direction, and a third direction Z, wherein the second direction can refer to a direction perpendicular to the first direction X and the third direction Z. For example, the first direction X is the width direction of the battery cell 10, the second direction is the length direction of the battery cell 10, and the third direction Z is the height direction of the battery cell 10. For ease of understanding, the first wall 111 can be, but is not limited to, one of the upper shell wall, the lower shell wall, or one of the four surrounding side shell walls of the housing assembly 11, etc. For example, referring to Figure 4 The upper shell wall parallel to the first direction X is provided with mounting holes 111a, and this upper shell wall can serve as the first wall 111.

[0110] The explanation of electrode assembly 13 can be found above, and will not be repeated here.

[0111] The terminal assembly 12 can refer to the component in the battery cell 10 that connects the internal electrode assembly 13 to the external circuit. The terminal body 121 can be a conductor, and its material can be, but is not limited to, metallic materials, such as copper or aluminum. The first clamping member 122 can refer to a structure or component that fixes the terminal body 121 through an insulating sealing structure 124. The second clamping member 123 can refer to a structure or component that fixes the terminal body 121 through an insulating sealing structure 124. The first clamping member 122 and the second clamping member 123 together form a clamping groove for clamping the terminal body 121. The first clamping member 122 and the second clamping member 123 can be made of metallic or non-metallic materials, and can be connected by methods including but not limited to welding and bonding. The first clamping member 122 and the second clamping member 123 together constitute a connection structure that fixes the terminal body 121 and the first wall 111.

[0112] The connection method between the electrode post body 121 and the electrode assembly 13 can include, but is not limited to, ultrasonic welding, ultrasonic pre-welding + laser welding, resistance welding, pressure welding, brazing, or adhesive bonding. The electrode post assembly 12 in the above structure can be either the positive or negative electrode of the battery cell 10. The electrode post body 121 can be a component made of a single material (e.g., pure aluminum electrode post, pure copper electrode post, etc.) or a component made of composite materials (e.g., copper-aluminum composite electrode post).

[0113] The electrode body 121 is connected to the first wall 111 through the first clamping member 122 and the second clamping member 123. Thus, a portion of the electrode body 121 is disposed in the clamping groove formed by the first clamping member 122 and the second clamping member 123. With this structure, the first clamping member 122 and the second clamping member 123 can firmly fix the electrode body 121, reduce the probability of loosening between the electrode body 121 and the first wall 111, and improve the connection reliability between the electrode body 121 and the first wall 111. On the other hand, it can also provide clear positioning and guidance for the electrode body 121 during the assembly process of the battery cell 10, which is conducive to improving assembly efficiency and assembly accuracy. When the pole body 121 is subjected to a force moving away from the first wall 111, for example, the internal air pressure of the housing assembly 11 is high and applies a pull-out force to the pole body 121 toward the outside of the housing assembly 11, or the pull-out force is formed by the action of the conductive component (e.g., bar plate) connected to the pole body 121, the first clamping member 122 can apply a constraint force to the pole body 121 in the opposite direction to the pull-out force.

[0114] In the structure of the second clamping member 123, since the first part 1231 is the part connected to the first clamping member 122, the thickness of the first part 1231 is greater than the thickness of the second part 1232 in the thickness direction of the first wall 111, so the first part 1231 has a larger thickness and higher structural strength and rigidity. When the terminal body 121 is subjected to a force along the third direction Z, whether the force acts on the terminal body 121 from the outside of the housing assembly 11 or from the inside of the housing assembly 11, the first part 1231 can withstand a greater force when the force is transmitted to the second clamping member 123, reducing the risk of bending deformation. This effectively reduces the risk of the terminal body 121 detaching from the first wall 111 under stress. Furthermore, it reduces the risk of insufficient compression of the insulation sealing structure 124 due to deformation of the second clamping member 123, thereby improving the reliability of the terminal assembly 12 and consequently the battery cell 10. Secondly, the above structure also allows for a reduction in the size and weight of the second clamping member 123 while maintaining high structural strength and rigidity, which is also beneficial for increasing the energy density of the battery cell 10.

[0115] On the other hand, the second part 1232 is bent towards the side closer to the insulating and sealing structure 124 relative to the first part 1231. This structure allows the second part 1232 to more directly increase the compression of the insulating and sealing structure 124, improving the insulation and sealing reliability of the terminal assembly 12. When the force acting on the first clamping member 122 and the second clamping member 123 is removed during assembly, even if the compression of the insulating and sealing structure 124 decreases due to the slight deformation and rebound of the first clamping member 122 and the second clamping member 123, the original compression of the insulating and sealing structure 124 was already relatively large. This helps ensure that the actual compression of the insulating and sealing structure 124 meets the design requirements, thus improving the insulation and sealing reliability of the terminal assembly 12. Therefore, adopting the above structure can also improve the insulation and sealing performance of the terminal assembly 12 from another perspective, thereby improving the reliability of the battery cell 10.

[0116] The first clamping member 122 and the second clamping member 123 can be an annular structure arranged around the pole body 121 in the circumferential direction, or they can be multiple components arranged in the circumferential direction of the pole body 121. No specific restrictions are made here.

[0117] It should be noted that in the above embodiments, the housing assembly 11, the first clamping member 122, the second clamping member 123, and the pole body 121 or other components can be formed by processes such as stamping and extrusion, which are mature, inexpensive, and have high structural strength.

[0118] In the above technical solution, the first clamping member 122 and the second clamping member 123 constitute a connection structure connecting the electrode body 121 and the housing assembly 11. By setting the second clamping member 123 to include a first part 1231 and a second part 1232, the first part 1231 is connected to the first clamping member 122, and the second part 1232 and the first clamping member 122 are clamped to the electrode body 121 by an insulating sealing structure 124. In the thickness direction of the first wall 111, the thickness of the first part 1231 is greater than the thickness of the second part 1232. The second part 1232 is bent relative to the first part 1231 towards the side closer to the insulating sealing structure 124, thereby improving the structural strength and rigidity of the second clamping member 123, improving the connection reliability between the electrode body 121 and the first wall 111, reducing the risk of the electrode body 121 being dislodged from the housing assembly 11 under force, and thus improving the reliability of the battery cell 10. Furthermore, since the second part 1232 of the second clamping member 123 is bent toward the side closer to the insulating sealing structure 124 relative to the first part 1231, this structure can also increase the compression of the insulating sealing structure 124, thereby enhancing the insulation and sealing effect of the insulating sealing structure 124 on the electrode body 121, and further improving the reliability of the battery cell 10.

[0119] In some embodiments of this application, in the thickness direction of the first wall 111, the thickness of the second portion 1232 is greater than half the thickness of the first portion 1231.

[0120] "In the thickness direction of the first wall 111", you can refer to Figure 3 The third party Z. "The thickness of the second part 1232 is greater than half the thickness of the first part 1231" can be understood as the ratio of the thickness of the second part 1232 to the thickness of the first part 1231 being, but not limited to, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, etc.

[0121] In the above technical solution, the second part 1232 plays a crucial role in clamping the electrode body 121 and cooperating with the insulating sealing structure 124. Its greater thickness enhances the strength and rigidity of the second part 1232, ensuring sufficient pressure when clamping the electrode body 121, preventing deformation or damage to the battery cell 10 when subjected to a third-direction Z-force. The thickness of the second part 1232 and the first part 1231, within the limits described above, also helps to balance the size and weight of the second clamping member 123 while maintaining high structural strength and rigidity. In other words, minimizing the size and weight of the second clamping member 123 improves the energy density of the battery cell 10.

[0122] In some embodiments of this application, reference is made to Figure 4 and Figure 5 The first clamping member 122 includes a horizontal arm 1221, a vertical arm 1222, and a clamping arm 1223. The horizontal arm 1221 is connected to the first part 1231, and the vertical arm 1222 is connected to the horizontal arm 1221 and the clamping arm 1223. The clamping arm 1223 and the second part 1232 clamp the pole body 121 through an insulating sealing structure 124. In the direction from the vertical arm 1222 to the pole body 121, the size of the horizontal arm 1221 is smaller than the minimum size of the first part 1231.

[0123] refer to Figure 5 The first clamping member 122 can be composed of three arms. The horizontal arm 1221 is placed horizontally along the first direction X and connected to the first part 1231. The vertical arm 1222 is an arm that is generally upright or directly upright. The clamping arm 1223 is placed horizontally along the first direction X and clamps the pole body 121 through the insulating sealing structure 124.

[0124] "In the direction from the vertical arm 1222 to the pole body 121", please refer to Figure 4 The first direction is X.

[0125] When the pole body 121 is subjected to a pull-out force moving away from the first wall 111, the pole body 121 acts on the clamping arm 1223. Assuming the torque that causes the connection between the horizontal arm 1221 and the first part 1231 to break is M, the constraint arm formed on the first clamping member 122 has a length of L, and the force of the pole body 121 acting on the clamping arm 1223 is F1, then the product of F1 and L is greater than M. The connection between the horizontal arm 1221 and the first part 1231 breaks, which will lead to the risk of the pole body 121 detaching from the housing assembly 11. The first clamping member 122 with the above structure can make the connection position of the horizontal arm 1221 and the first part 1231 closer to the clamping arm 1223 in the first direction X. This makes the length of the constraint arm L formed on the first clamping member 122 smaller. The electrode body 121 needs to be subjected to a larger pull force to cause the connection position of the horizontal arm 1221 and the first part 1231 to break. This reduces the risk of deformation between the horizontal arm 1221 and the first part 1231 causing the electrode body 121 to come off, thereby improving the reliability of the electrode assembly 12 and thus improving the reliability of the battery cell 10.

[0126] The connection point between the first part 1231 and the first wall 111 can be called the first connection position, and the connection point between the cross arm 1221 and the first part 1231 can be called the second connection position. Since the clamping arm 1223 and the second part 1232 cooperate to clamp the pole body 121, the ends of the clamping arm 1223 and the second part 1232 are usually aligned. This makes the first clamping member 122 closer to the second part 1232. Since the size of the cross arm 1221 is smaller than the minimum size of the first part 1231, it is beneficial to make the distance between the second connection position and the first connection position larger, which can reduce the impact on the connection reliability of the first clamping member 122 and the second clamping member 123 due to the close distance between the second connection position and the first connection position.

[0127] For ease of understanding, let's take the example of the first part 1231 being welded to the first wall 111, and the cross arm 1221 being welded to the first part 1231. Both the first and second connection positions form weld marks. This method reduces the mutual influence of the two weld marks. Because the two weld marks are far apart, the reliability of the connection between the first part 1231 and the first wall 111, as well as the reliability of the connection between the cross arm 1221 and the first part 1231, can be guaranteed. Similarly, if the first part 1231 and the first wall 111, and the cross arm 1221 and the first part 1231 are connected by hot riveting, the problem of the connection reliability being affected by the close proximity of the two connection positions can also be effectively alleviated.

[0128] In the above technical solution, the first clamping member 122 with the above structure can improve the clamping reliability of the electrode body 121, and also improve the structural strength and rigidity of the first clamping member 122 itself, reducing the risk of large deformation of the first clamping member 122 when the electrode body 121 is subjected to force, thereby improving the installation reliability of the electrode body 121. By making the size of the horizontal arm 1221 smaller than the minimum size of the first part 1231 in the direction of the vertical arm 1222 pointing to the electrode body 121, it is beneficial to have a larger gap at the connection between the first part 1231 and the first wall 111 and the connection between the horizontal arm 1221 and the first part 1231. This can reduce the mutual influence between the connection positions of the first clamping member 122 and the second clamping member 123 during assembly, which is beneficial to improve the connection reliability of the first clamping member 122 and the second clamping member 123, and thus also improve the overall reliability of the battery cell 10.

[0129] In some embodiments of this application, reference is made to Figure 4 In the direction from the vertical arm 1222 to the pole body 121, the minimum dimension of the first part 1231 is W1, and the dimension of the horizontal arm 1221 is W2, where 1.5mm≤W2≤W1≤2mm.

[0130] "In the direction from the vertical arm 1222 to the pole body 121" can be referred to Figure 4 The first direction is X. It is understood that W1 and W2 can be, but are not limited to, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc., where W2 can be less than or equal to W1. The minimum dimension of the first part 1231 is W1, and the dimension of the cross arm 1221 is W2, where 1.5mm ≤ W2 ≤ W1 ≤ 2mm. As an example, when W1 is 1.8mm, W2 can be 1.5mm, 1.6mm, 1.7mm, etc.

[0131] In the above technical solution, by setting the dimensions of the first part 1231 and the cross arm 1221 within the above range, the size and weight of the first part 1231 and the cross arm 1221 can be reduced while minimizing the impact between the connection between the first part 1231 and the first wall 111 and the connection between the cross arm 1221 and the first part 1231. This is beneficial to improving the structural compactness of the first clamping member 122 and the second clamping member 123, reducing the size and weight of the pole assembly 12, and thereby increasing the energy density of the battery cell 10.

[0132] In some embodiments of this application, reference is made to Figure 5 and Figure 6 The second clamping member 123 is bent to form a first stepped portion 1233 on the side away from the first clamping member 122.

[0133] The first step portion 1233 can refer to a step structure formed on the surface of the second clamping member 123 by pressing or bending, and the first step portion 1233 can be, but is not limited to, one or more steps.

[0134] In the above technical solution, the first step portion 1233 can strengthen the second clamping member 123. It can be configured with raised or recessed ribs, similar to those found on sheet metal, thereby improving the structural strength and rigidity of the second clamping member 123. On the other hand, the first step portion 1233 can also better distribute stress, preventing deformation of the second clamping member 123, thus ensuring the stability of the terminal assembly 12 and preventing the terminal body 121 from loosening or shifting due to deformation of the second clamping member 123, ensuring the normal operation of the battery device 100.

[0135] In some embodiments of this application, reference is made to Figure 5 and Figure 6 The first part 1231 has an inner side surface 1231a facing into the housing assembly 11, and the first step part 1233 is provided with a transition surface 1233a connecting the first part 1231 and the second part 1232. The transition surface 1233a and the inner side surface 1231a are arranged at an angle.

[0136] In the above technical solution, the inner surface 1231a and the transition surface 1233a can be straight surfaces. The first step portion 1233 with the above structure has a simple structure, is easy to process and manufacture, can reduce manufacturing difficulty and improve product yield.

[0137] In some embodiments of this application, reference is made to Figure 6 An angle θ is formed between the transition surface 1233a and the inner surface 1231a, wherein 90 degrees ≤ θ ≤ 180 degrees.

[0138] θ can be, but is not limited to, 90 degrees, 91 degrees, 92 degrees, 93 degrees, 95 degrees, 97 degrees, 100 degrees, 102 degrees, 105 degrees, 107 degrees, 109 degrees, 110 degrees, 112 degrees, 115 degrees, 117 degrees, 120 degrees, 130 degrees, 140 degrees, 150 degrees, 160 degrees, 170 degrees, 180 degrees, etc.

[0139] In the above technical solution, within this angle range, a relatively large angle change area is formed between the transition surface 1233a and the inner surface 1231a. This increases the selectable range of the effective included angle between the transition surface 1233a and the inner surface 1231a during manufacturing, reducing manufacturing difficulty. The above solution also enhances the strength reinforcement effect of the first step portion 1233 on the second clamping member 123, giving the second clamping member 123 higher structural strength and rigidity. When the battery cell 10 is subjected to external forces, such as vibration or impact, this angle setting helps to distribute the external force over a larger area, avoiding stress concentration at a localized location on the second clamping member 123, thereby ensuring that the root of the second clamping member 123 meets the required rigidity requirements.

[0140] In some embodiments of this application, reference is made to Figure 4 and Figure 5 The first clamping member 122 includes a horizontal arm 1221, a vertical arm 1222 and a clamping arm 1223. The horizontal arm 1221 is connected to the first part 1231. The vertical arm 1222 is perpendicular to the horizontal arm 1221 and the clamping arm 1223. The clamping arm 1223 is parallel to the first wall 111. The clamping arm 1223 and the second part 1232 are clamped to the pole body 121 by an insulating sealing structure 124. The first step portion 1233 is provided on the side of the vertical arm 1222 near the pole body 121.

[0141] In the above technical solution, when the electrode body 121 is subjected to force, the bending and torsional action point transmitted to the second clamping member 123 is concentrated on the side of the second clamping member 123 away from the electrode body 121. Therefore, by setting the first step portion 1233 on the side of the upright arm 1222 close to the electrode body 121, the strength amplification effect of the first step portion 1233 on the second clamping member 123 can be greater on the first part 1231, which can play a better reinforcing role, reduce the risk of bending deformation of the second clamping member 123 when subjected to force, and help to further improve the reliability of the battery cell 10.

[0142] In some embodiments of this application, reference is made to Figure 6 In the thickness direction of the first wall 111, the height of the first step portion 1233 is H, where 0.1mm≤H≤0.4mm. It can be understood that the height H of the first step portion 1233 can be, but is not limited to, 0.1mm, 0.2mm, 0.3mm, 0.4mm, etc.

[0143] In the above technical solution, by setting the height of the first step portion 1233 within the aforementioned range, the first step portion 1233 can have a high strength enhancement effect. When the pole body 121 is subjected to external force, the deformation of the first part 1231 and the second part 1232 can be reduced, thereby preventing the pole body 121 from loosening due to deformation of the clamping parts. At the same time, the height difference range of 0.1mm≤H≤0.4mm places relatively moderate requirements on the production process. It will not significantly increase the processing difficulty due to an excessively small height difference, nor will it increase material costs and occupy too much space due to an excessively large height difference.

[0144] In some embodiments of this application, reference is made to Figure 5 The first part 1231 includes a first section 12311 and a second section 12312 connected together. The first section 12311 is connected to the first wall 111, and the thickness of the first section 12311 is greater than the thickness of the second section 12312. The second section 12312 is connected to the second part 1232.

[0145] The statement that "the thickness of the first segment 12311 is greater than the thickness of the second segment 12312" is understandable, referring to... Figure 4 On the third direction Z, the thickness of the first segment 12311 is greater than the thickness of the second segment 12312.

[0146] In the above technical solution, the first section 12311, connected to the first wall 111, has a relatively large thickness, providing sufficient strength to withstand the forces from the first wall 111 and the external environment, preventing damage or deformation at the connection between the first section 1231 and the first wall 111. The second section 12312, with a smaller thickness, connects to the second section 1232. While ensuring the connection strength with the second section 1232, it can reduce the overall weight, avoid material waste, and lower costs.

[0147] In some embodiments of this application, reference is made to Figure 5 The inner side of the mounting hole 111a is provided with a protrusion 1111, and the first section 12311 is provided with a second step 12313, which is engaged with the protrusion 1111.

[0148] In the above technical solution, the cooperation between the second step portion 12313 and the protrusion 1111 provides a precise positioning reference for the installation of the second clamping member 123 at the mounting hole 111a. During assembly, this ensures that the second clamping member 123 is accurately installed in the predetermined position, reducing assembly errors and improving assembly efficiency. Simultaneously, the second step portion 12313 and the protrusion 1111 can support each other, sharing the external force under load and avoiding localized stress concentration, thereby improving the deformation resistance and load-bearing capacity of the connection between the protrusion 1111 and the second step portion.

[0149] In some embodiments of this application, reference is made to Figure 5 In the direction from the first clamping member 122 to the pole body 121, the thickness of the second section 12312 remains equal, and the thickness of the second part 1232 remains equal.

[0150] "In the direction in which the first clamping member 122 points toward the pole body 121", it can be referred to Figure 4 The third party to Z.

[0151] In the above technical solution, when the electrode body 121 is subjected to external force (such as vibration, impact, etc.), the uniform thickness makes the stress distribution of the second section 12312 and the second part 1232 more uniform when under force, and will not cause stress concentration due to local thickness differences, thereby enhancing the structural stability and mechanical strength of the second clamping member 123, reducing the risk of deformation and damage, and helping to improve the reliability of the electrode assembly 12 and the reliability of the battery cell 10.

[0152] In some embodiments of this application, reference is made to Figure 4 The first section 12311 and the second section 12312 have a groove 1231c formed on the side facing the first clamping member 122, and the first clamping member 122 is disposed in the groove 1231c.

[0153] The groove 1231c can refer to a recessed part with a certain depth and shape processed on the surface of an object, which can be, but is not limited to, a rectangle, trapezoid, semicircle, etc.

[0154] In the above technical solution, the groove 1231c provides precise positioning and installation space for the first clamping member 122, enabling the first clamping member 122 to be accurately placed in the predetermined position during installation, reducing assembly errors. Simultaneously, with the first clamping member 122 embedded in the groove 1231c, when the terminal body 121 is subjected to external force, stress can be transmitted more evenly through the contact area between the first clamping member 122 and the second clamping member 123, reducing the risk of component damage due to localized stress concentration. This enhances the mechanical strength and durability of the terminal assembly 12 and extends the service life of the battery cell 10.

[0155] In some embodiments of this application, reference is made to Figure 4The first clamping member 122 includes a horizontal arm 1221, a vertical arm 1222, and a clamping arm 1223. The horizontal arm 1221 is connected to the first part 1231, and the vertical arm 1222 is connected to the horizontal arm 1221 and the clamping arm 1223. The clamping arm 1223 is parallel to the first wall 111. The clamping arm 1223 and the second part 1232 clamp the electrode body 121 through an insulating sealing structure 124. The horizontal arm 1221 is disposed in the groove 1231c. The horizontal arm 1221 has a first outer side 1221a away from the electrode assembly 13. The first section 12311 has a second outer side 1231d away from the electrode assembly 13. The second outer side 1231d and the first outer side 1221a are coplanar.

[0156] The horizontal arm 1221 is disposed within the groove 1231c and connected to the first segment 12311, thereby connecting the first clamping member 122 and the second clamping member 123. Regardless of whether the horizontal arm 1221 and the first segment 12311 are connected by welding or bonding, the connection position of the horizontal arm 1221 and the first segment 12311 is located on the second outer surface 1231d and the first outer surface 1221a. Therefore, by adopting a coplanar design for the second outer surface 1231d and the first outer surface 1221a, the connection between the horizontal arm 1221 and the first segment 12311 is facilitated. Taking welding as an example, the coplanarity of the second outer surface 1231d and the first outer surface 1221a facilitates the formation of reliable weld marks, improving the connection stability and reliability of the horizontal arm 1221 and the first segment 12311.

[0157] In the above technical solution, the second outer surface 1231d and the first outer surface 1221a are coplanar, which is beneficial for the connection of the cross arm 1221 and the second clamping member 123, improving connection reliability. It also reduces the risk of protruding structures on the outer side of the electrode assembly 12, reduces the risk of interference when the electrode assembly 12 is connected to other external conductive components, and helps to reduce the size and weight of the electrode assembly 12, thereby increasing the energy density of the battery cell 10. In some embodiments of this application, refer to... Figure 5 The second clamping member 123 includes a third part 1234, which is connected to the side of the second part 1232 away from the electrode assembly 13. In the above technical solution, the third part 1234 can better cooperate with the insulating sealing structure 124, further increasing the compression of the insulating sealing structure 124, thereby further enhancing the insulation and sealing effect of the electrode body 121.

[0158] In some embodiments of this application, reference is made to Figure 5 The third part 1234 is located at the end of the second part 1232 away from the first part 1231, and is set at an angle to the second part 1232.

[0159] In the above technical solution, the included angle setting can change the force transmission path, more effectively disperse stress, prevent the second part 1232 from deforming or being damaged due to force concentration, thereby helping to maintain the stability of the pole assembly 12, ensuring the pole body 121 is firmly installed, and ensuring the reliability of the internal electrical connection of the battery cell 10. At the same time, the third part 1234 can solve the problem of insufficient compression of the insulation sealing structure 124 of the pole assembly 12.

[0160] In some embodiments of this application, reference is made to Figure 5 and Figure 6 The third part 1234 is perpendicular to the second section 12312. In the above technical solution, the vertical structure allows the third part 1234 and the second section 12312 to form a stable "L"-shaped structure. This vertical connection can effectively disperse stress, enhance the overall rigidity of the second clamping member 123, and prevent structural deformation. The above structure also allows the third part 1234 to exert positive pressure on the insulating sealing structure 124, which is beneficial to give the insulating sealing structure 124 a greater compression capacity and improve the reliability of insulation and sealing.

[0161] In some embodiments of this application, reference is made to Figure 4 and Figure 5 The insulating sealing structure 124 includes a sealing element 1241 and a first insulating element 1242. The sealing element 1241 is disposed between the pole body 121 and the second clamping element 123, and the first insulating element 1242 is disposed between the pole body 121 and the first clamping element 122.

[0162] The seal 1241 can refer to a structure or component used to isolate the interior of the battery cell 10 from the external environment, and the material can include, but is not limited to, rubber (e.g., nitrile rubber), plastic (e.g., polyolefins), etc. The seal 1241 can be understood as an annular structure positioned in a third direction Z around the electrode post body 121. For example, the seal 1241 can be a sealing ring.

[0163] The first insulating member 1242 can refer to a component used to prevent short circuits between the electrode body 121 and the housing assembly 11, and its material can include, but is not limited to, plastics (e.g., polyethylene, polypropylene, polycarbonate, polyamide), ceramics, etc. For example, the first insulating member 1242 can be a plastic part. The first insulating member 1242 can be a pre-formed part, subsequently assembled between the electrode body 121 and the first clamping member 122, or it can be injection molded between the electrode body 121 and the first clamping member 122. The first insulating member 1242 can be a ring-shaped structure arranged circumferentially around the electrode body 121.

[0164] In the above technical solution, by setting the sealing element 1241, the sealing performance between the terminal body 121 and the second clamping element 123 can be improved, reducing the risk of electrolyte leakage inside the housing assembly 11 and reducing the probability of external moisture, dust, and other particulate matter entering the housing assembly 11, thereby improving the reliability of the battery cell 10. By setting the first insulating element 1242, an insulating connection can be achieved between the first clamping element 122 and the terminal body 121, reducing the risk of short circuit between the first clamping element 122 and the terminal body 121. Moreover, it can also play a certain sealing role between the first clamping element 122 and the terminal body 121, enhancing the sealing performance between the first clamping element 122 and the terminal body 121, thereby improving the reliability of the terminal assembly 12 and thus improving the reliability of the battery cell 10.

[0165] In some embodiments of this application, reference is made to Figure 4 and Figure 5 The insulating sealing structure 124 includes a second insulating member 1243, which is disposed on the outer side of the first clamping member 122 away from the pole body 121 and is connected to the first insulating member 1242.

[0166] The second insulating member 1243 and the first insulating member 1242 can be made of the same or different materials, and both can serve as insulation and a certain degree of sealing. For example, the second insulating member 1243 is a plastic part. The second insulating member 1243 can be a pre-formed part, subsequently assembled onto the outer surface of the first clamping member 122, or it can be injection molded onto the outer surface of the pole body 121. The second insulating member 1243 can be a ring-shaped structure circumferentially arranged around the pole body 121.

[0167] In the above technical solution, the second insulating member 1243 connects to the first insulating member 1242 and covers the outer surface of the first clamping member 122 away from the terminal body 121, which can further expand the insulation area and form a more comprehensive insulation protection layer. This not only prevents leakage between the terminal body 121 and the first clamping member 122, but also avoids potential electrical conduction between the outer surface of the first clamping member 122 and other surrounding components, effectively improving the insulation performance of the battery cell 10, reducing the risk of leakage, and increasing the reliability of the battery cell 10. The second insulating member 1243 and the first insulating member 1242 are connected, thereby forming a continuous insulation barrier and increasing the insulation boundary, enhancing the insulation performance between the terminal body 121 and the first clamping member 122, and thus improving the reliability of the terminal assembly 12, which in turn improves the reliability of the battery cell 10.

[0168] In some embodiments of this application, reference is made to Figure 4 and Figure 5The first insulating component 1242 and the second insulating component 1243 are integrally formed. In this technical solution, the integrally formed structural design helps to reduce the number of parts, thereby reducing assembly steps, simplifying the production process, and reducing manufacturing costs.

[0169] In some embodiments of this application, reference is made to Figure 4 and Figure 5 The insulating sealing structure 124 includes a third insulating member 1244, which is disposed on the side of the second clamping member 123 near the electrode assembly 13, and abuts against the sealing member 1241.

[0170] The third insulating member 1244 and the first insulating member 1242 can be made of the same or different materials, and both can serve as insulation and a certain degree of sealing. For example, the third insulating member 1244 is a plastic part, and can be a pre-formed part or an injection-molded part. The third insulating member 1244 can be a ring-shaped structure arranged circumferentially around the pole post body 121.

[0171] In the above technical solution, the third insulating member 1244 is disposed on the side of the second clamping member 123 near the electrode assembly 13, further expanding the insulation area and effectively isolating the electrical connection between the electrode assembly 13 and the second clamping member 123. The third insulating member 1244 abuts against the sealing member 1241, forming a more complete insulation barrier, preventing current leakage to the second clamping member 123, avoiding possible short circuits and leakage risks, and improving the reliability of the battery cell 10.

[0172] In some embodiments of this application, reference is made to Figure 4 and Figure 5 The battery cell 10 includes an insulating component 14, which is disposed on the inner side of the first wall 111 and abuts against or connects to the third insulating component 1244.

[0173] The insulating component 14 and the first insulating component 1242 can be made of the same or different materials, and can also serve as insulation and a certain degree of sealing. For example, the insulating component 14 is a plastic part, and can be in the form of a thin plate.

[0174] In the above technical solution, the insulating component 14 is installed inside the first wall 111 and is connected to or abuts against the third insulating component 1244, providing additional support for the internal structures such as the pole assembly 12 and the electrode assembly 13. The insulating component 14 abuts against or connects with the third insulating component 1244, forming a more complete and continuous insulation system, thereby expanding the insulation range and reducing the risk of short circuits caused by electrical contact between the electrode assembly 13 and the first wall 111.

[0175] In some embodiments of this application, reference is made to Figure 3and Figure 4 The housing assembly 11 includes a housing 112 and a cover plate 113. One end of the housing 112 has an opening 112a, and the cover plate 113 covers the opening 112a. A first wall 111 is provided on the housing 112 or the cover plate 113.

[0176] The outer shell 112 can refer to an assembly consisting of multiple shell walls surrounding a bottom wall. The cover plate 113 can close the plate of the outer shell 112. It is understood that in the shell assembly 11, the first wall 111 can be provided on the cover plate 113 or on any shell wall of the outer shell 112.

[0177] In the above technical solution, the shell and cover plate 113 together form a relatively enclosed space, which can effectively protect the internal components of the battery cell 10 from external physical impacts, dust, moisture, and corrosive substances, reduce the risk of damage to internal components, extend the service life of the battery cell 10, and thus ensure the stability and reliability of the battery cell 10's performance. Adopting the above solution also provides more options for the installation of the terminal assembly 12, thereby expanding the structural forms of the battery cell 10 and helping to meet different design requirements.

[0178] In some embodiments of this application, reference is made to Figure 3 The first wall 111 is bent to form a protruding structure 15, which surrounds the mounting hole 111a.

[0179] In the above technical solution, the protruding structure 15 can play a role in strengthening the first wall 111, improving the structural strength and rigidity of the first wall 111, and can better withstand the force from the electrode body 121, reducing the risk of deformation of the first wall 111, thereby improving the reliability of the battery cell 10.

[0180] In other embodiments of this application, reference is made to Figure 3 and Figure 7 The protruding structure 15 is provided on the first wall 111 facing away from the electrode assembly 13.

[0181] In other embodiments of this application, reference is made to Figure 8 The protruding structure 15 is provided on the first wall 111 protruding toward the side near the electrode assembly 13.

[0182] In some embodiments of this application, reference is made to Figure 9 The first clamping member 122 and the second clamping member 123 are insulated and sealed to the mounting hole 111a. The second clamping member 123 is bent to form a protruding structure 15, which is arranged around the mounting hole 111a.

[0183] In the above technical solution, the protruding structure 15 can strengthen the second clamping member 123, improve the structural strength and rigidity of the second clamping member 123, and thus better withstand the force from the pole body 121, reduce the risk of large deformation of the second clamping member 123, and reduce the probability of the pole body 121 detaching from the first clamping member 122 and the second clamping member 123. It can also reduce the probability of insufficient compression of the insulating sealing structure 124, thereby improving the reliability of the pole assembly 12 and the reliability of the battery cell 10.

[0184] In some embodiments of this application, the protruding structure 15 protrudes from the second clamping member 123 toward the side closer to the electrode assembly 13.

[0185] In some embodiments of this application, the protruding structure 15 protrudes from the second clamp 123 toward the side away from the electrode assembly 13.

[0186] In some embodiments of this application, reference is made to Figure 10 and Figure 11 The first clamping member 122 includes a first material layer 1201 and a second material layer 1202 connected together. The second material layer 1202 is disposed on the side of the first material layer 1201 close to the second clamping member 123, and its strength is greater than that of the first material layer 1201.

[0187] The first material layer 1201 and the second material layer 1202 can refer to two layered structural components made of different materials, wherein the material strength of the second material layer 1202 is greater than that of the first material layer 1201. The materials of the first material layer 1201 and the second material layer 1202 can be, but are not limited to, aluminum and aluminum alloys, copper and copper alloys, stainless steel, lead, nickel and nickel alloys, etc. (Refer to...) Figure 11 Before manufacturing, the first clamping member 122 can be formed by stacking a first material layer 1201 and a second material layer 1202, and then extruding or bending it to form the desired shape.

[0188] In the above technical solution, by setting the first clamping member 122 into the above structure, the second material layer 1202 can be used as a reinforcing material to improve the overall structural strength and rigidity of the first clamping member 122, thereby improving the effect of the first clamping member 122 to withstand greater forces, reducing the risk of deformation of the first clamping member 122, and thus reducing the risk of loosening between the pole body 121 and the first clamping member 122, thereby improving the overall reliability of the pole assembly 12.

[0189] In some embodiments of this application, the first material layer 1201 and the first wall 111 are made of the same material. It is understood that making the first material layer 1201 and the first wall 111 of the same material facilitates their connection. For example, the first clamping member 122 is typically connected to the housing assembly 11 by welding; using the same material for the first material layer 1201 and the first wall 111 facilitates good welding and improves connection reliability.

[0190] In some embodiments of this application, the first material layer 1201 and the first wall 111 are made of aluminum, and the second material layer 1202 is made of stainless steel. In this technical solution, the first material layer 1201 and the first wall 111 are made of aluminum, which can reduce material costs, while the second material layer 1202 is made of stainless steel, which can reduce material costs while providing good reinforcement.

[0191] In some embodiments of this application, reference is made to Figure 10 and Figure 12 The second clamping member 123 includes a third material layer 1203 and a fourth material layer 1204 connected together. The fourth material layer 1204 is disposed on the side of the third material layer 1203 near the first clamping member 122, and its strength is greater than that of the third material layer 1203.

[0192] The third material layer 1203 and the fourth material layer 1204 can refer to layered structural components made of two different materials, wherein the material strength of the fourth material layer 1204 is greater than that of the third material layer 1203. The materials of the third material layer 1203 and the fourth material layer 1204 can be, but are not limited to, aluminum and aluminum alloys, copper and copper alloys, stainless steel, lead, nickel and nickel alloys, etc. (See reference...) Figure 12 Before manufacturing, the second clamping member 123 can be formed by stacking a third material layer 1203 and a fourth material layer 1204, and then extruding or bending it to form the desired shape.

[0193] In the above technical solution, by setting the second clamping member 123 into the above structure, the fourth material layer 1204 can be used as a reinforcing material to improve the overall structural strength and rigidity of the second clamping member 123, thereby improving the effect of the second clamping member 123 to withstand greater forces, reducing the risk of deformation of the second clamping member 123, and thus reducing the risk of loosening between the pole body 121 and the second clamping member 123, thereby improving the overall reliability of the pole assembly 12.

[0194] In some embodiments of this application, reference is made to Figure 10The electrode body 121 may include a first material part 12101 and a second material part 12102 connected together. The second material part 12102 is disposed on the side of the first material part 12101 near the electrode assembly 13 and is electrically connected to the electrode assembly 13.

[0195] The first material portion 12101 and the second material portion 12102 can refer to components made of different materials, and may include, but are not limited to, copper, aluminum, nickel, etc. The first material portion 12101 is made of the same material as the externally welded conductive component (e.g., a electrode). For example, the first material portion 12101 can be aluminum, and the second material portion 12102 can be copper.

[0196] It is understandable that the electrode body 121 is made of composite material. On the one hand, this structure can balance material cost and conductivity. For example, the second material part 12102 located inside the housing assembly 11 is copper, which can have high conductivity and facilitate efficient current conduction between the electrode body 121 and the electrode assembly 13. On the other hand, the first material part 12101 on the outside can be aluminum, which can reduce cost while having good conductivity.

[0197] On the other hand, in order to ensure efficient current conduction between the electrode assembly 12 and the electrode assembly 13, the part where the electrode body 121 and the electrode assembly 13 are connected is preferably made of a material with high conductivity, which results in higher material costs. The electrode body 121 needs to be welded to external conductive components, such as a bar plate. The bar plate is made of aluminum, which is cheaper and has better conductivity. In this case, the material of the electrode is often different from that of the bar plate, which is not conducive to welding. In this case, the electrode body 121 is composed of two materials: a first material part 12101 and a second material part 12102. This can satisfy the requirements of efficient current conduction while also facilitating welding to external conductive components.

[0198] In the above technical solution, by setting the electrode body 121 to include a first material part 12101 and a second material part 12102, the electrode body 121 can be a composite material electrode, which can reduce costs while meeting the requirements of efficient current conduction, and also facilitates the welding of the electrode body 121 to external conductive components, thereby improving the manufacturability of the electrode component 23 and increasing the product yield of the electrode component 23.

[0199] Reference Figure 2 This application provides a battery device 100, which includes a battery cell 10 as described in any of the embodiments above.

[0200] In the above technical solution, since the battery cell 10 has high reliability, the battery device 100 using the battery cell 10 can have good reliability.

[0201] Reference Figure 1 This application provides an electrical device 1000, which includes a battery cell 10 as described in any of the preceding embodiments, or a battery device 100 as described in the preceding embodiments.

[0202] In the above technical solution, since the battery cell 10 or battery device 100 has high reliability, it is beneficial to improve the reliability of the electrical device 1000 that uses the battery cell 10 or battery device 100.

[0203] The following reference Figures 3 to 6 A battery cell 10 provided according to an embodiment of this application includes: a housing assembly 11, a terminal assembly 12, an electrode assembly 13, an insulating sealing structure 124, and an insulating component 14.

[0204] The housing assembly 11 includes a first wall 111, which has a mounting hole 111a.

[0205] The pole assembly 12 is installed in the mounting hole 111a and includes a pole body 121, a first clamping member 122, a second clamping member 123 and an insulating sealing structure 124.

[0206] The first clamping member 122 is disposed on the side of the second clamping member 123 away from the housing assembly 11. The second clamping member 123 includes a first portion 1231, a second portion 1232, and a third portion 1234. The first portion 1231 is connected to the first clamping member 122, and the second portion 1232 clamps the electrode body 121 with the first clamping member 122 through an insulating sealing structure 124. In the thickness direction of the first wall 111, the thickness of the first portion 1231 is greater than the thickness of the second portion 1232, and the second portion 1232 is bent relative to the first portion 1231 towards the side closer to the insulating sealing structure 124. The third portion 1234 is connected to the side of the second portion 1232 away from the electrode assembly 13, is disposed at an angle to the second portion 1232, and is perpendicular to the second section 12312.

[0207] The second clamping member 123 is bent to form a first step portion 1233 on the side away from the first clamping member 122.

[0208] The insulating sealing structure 124 includes a sealing element 1241, a first insulating element 1242, a second insulating element 1243, and a third insulating element 1244. The sealing element 1241 is disposed between the electrode post body 121 and the second clamping element 123; the first insulating element 1242 is disposed between the electrode post body 121 and the first clamping element 122; the second insulating element 1243 is disposed on the outer side of the first clamping element 122 away from the electrode post body 121 and is connected to the first insulating element 1242. The first insulating element 1242 and the second insulating element 1243 are integrally formed and are injection molded; the third insulating element 1244 is disposed on the side of the second clamping element 123 near the electrode assembly 13, and abuts against the sealing element 1241.

[0209] The electrode assembly 13 is located inside the housing assembly 11 and is electrically connected to the electrode body 121.

[0210] The insulating component 14 is a lower plastic part, located on the inner side of the first wall 111, and abuts against or connects to the third insulating component 1244.

[0211] It should be noted that, referring to Figure 13 In the above technical solution, each component of the electrode assembly 12 is pre-assembled before assembly. The electrode assembly 13 can be installed into the housing assembly 11 first. The electrode tab 131 of the electrode assembly 13 passes through the mounting hole 111a. The electrode tab 131 is welded to the electrode body 121 of the electrode assembly 12 on the outside of the housing assembly 11. Then, the second clamping member 123 of the electrode assembly 12 is installed in the mounting hole 111a, and the first wall 111 and the second clamping member 123 are welded together. In the battery cell 10 with the above structure, the first clamping member 122 and the second clamping member 123 constitute a connection structure connecting the terminal body 121 and the housing assembly 11. By setting the second clamping member 123 to include a first part 1231 and a second part 1232, the first part 1231 is connected to the first clamping member 122, and the second part 1232 clamps the terminal body 121 with the first clamping member 122 through an insulating sealing structure 124. In the thickness direction of the first wall 111, the thickness of the first part 1231 is greater than the thickness of the second part 1232. The second part 1232 is bent relative to the first part 1231 towards the side closer to the insulating sealing structure 124, thereby improving the structural strength and rigidity of the second clamping member 123, improving the connection reliability between the terminal body 121 and the first wall 111, reducing the risk of the terminal body 121 being dislodged from the housing assembly 11 under force, and thus improving the reliability of the battery cell 10. Furthermore, since the second part 1232 of the second clamping member 123 is bent toward the side closer to the insulating sealing structure 124 relative to the first part 1231, this structure can also increase the compression of the insulating sealing structure 124, thereby enhancing the insulation and sealing effect of the insulating sealing structure 124 on the electrode body 121, and further improving the reliability of the battery cell 10.

[0212] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The above are merely preferred embodiments of this application and are not intended to limit the application. For those skilled in the art, unless otherwise specified, all implementation methods and optional implementation methods of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized by, include: A housing assembly, the housing assembly including a first wall having mounting holes; An electrode assembly is mounted in the mounting hole and includes an electrode body, a first clamping member, a second clamping member, and an insulating sealing structure. The first clamping member is located on the side of the second clamping member away from the housing assembly. The second clamping member includes a first part and a second part. The first part is connected to the first clamping member, and the second part and the first clamping member clamp the electrode body through the insulating sealing structure. In the thickness direction of the first wall, the thickness of the first part is greater than the thickness of the second part, and the second part is bent relative to the first part towards the side closer to the insulating sealing structure. An electrode assembly is disposed within the housing assembly and is electrically connected to the electrode body.

2. The battery cell according to claim 1, characterized in that, In the thickness direction of the first wall, the thickness of the second portion is greater than half the thickness of the first portion.

3. The battery cell according to claim 1 or 2, characterized in that, The first clamping member includes a horizontal arm, a vertical arm, and a clamping arm. The horizontal arm connects to the first part, and the vertical arm connects the horizontal arm and the clamping arm. The clamping arm and the second part clamp the pole body together through the insulating sealing structure. In the direction from the vertical arm to the pole body, the dimension of the horizontal arm is smaller than the minimum dimension of the first part.

4. The battery cell according to claim 3, characterized in that, In the direction from the upright arm to the pole body, the minimum dimension of the first part is W1, and the dimension of the cross arm is W2, wherein 1.5mm≤W2≤W1≤2mm.

5. The battery cell according to claim 1, characterized in that, The second clamping member is bent to form a first stepped portion on the side away from the first clamping member.

6. The battery cell according to claim 5, characterized in that, The first portion has an inner side facing into the housing assembly, and the first stepped portion has a transition surface connecting the first portion and the second portion, the transition surface and the inner side being set at an angle.

7. The battery cell according to claim 6, characterized in that, An angle θ is formed between the transition surface and the inner surface, wherein 90 degrees ≤ θ ≤ 180 degrees.

8. The battery cell according to claim 5, characterized in that, The first clamping member includes a horizontal arm, a vertical arm, and a clamping arm. The horizontal arm connects to the first part. The vertical arm is perpendicular to the horizontal arm and the clamping arm. The clamping arm is parallel to the first wall. The clamping arm and the second part clamp the pole body through the insulating sealing structure. The first step portion is provided on the side of the vertical arm near the pole body.

9. The battery cell according to any one of claims 5 to 8, characterized in that, In the thickness direction of the first wall, the height of the first step is H, where 0.1mm≤H≤0.4mm.

10. The battery cell according to claim 1, characterized in that, The first part includes a first segment and a second segment connected together. The first segment is connected to the first wall, and the thickness of the first segment is greater than the thickness of the second segment. The second segment is connected to the second part.

11. The battery cell according to claim 10, characterized in that, The mounting hole has a protrusion on its inner side, and the first section has a second step, which engages with the protrusion.

12. The battery cell according to claim 10, characterized in that, In the direction from the first clamping member to the pole body, the thickness of the second section remains equal, and the thickness of the second portion remains equal.

13. The battery cell according to claim 10, characterized in that, The first section and the second section have grooves formed on the side facing the first clamping member, and the first clamping member is disposed in the grooves.

14. The battery cell according to claim 13, characterized in that, The first clamping member includes a horizontal arm, a vertical arm, and a clamping arm. The horizontal arm connects to the first part, and the vertical arm connects the horizontal arm and the clamping arm. The clamping arm is parallel to the first wall, and the clamping arm and the second part clamp the electrode body through the insulating sealing structure. The horizontal arm is disposed in the groove and has a first outer side away from the electrode assembly. The first section has a second outer side away from the electrode assembly, and the second outer side and the first outer side are coplanar.

15. The battery cell according to claim 12, characterized in that, The second clamping member includes a third portion connected to the side of the second portion away from the electrode assembly.

16. The battery cell according to claim 15, characterized in that, The third part is located at the end of the second part away from the first part, and is set at an angle to the second part.

17. The battery cell according to claim 16, characterized in that, The third part is perpendicular to the second section.

18. The battery cell according to any one of claims 1, 2, 5 to 8, 10 to 17, characterized in that, The insulating sealing structure includes a sealing element and a first insulating element. The sealing element is disposed between the pole body and the second clamping element, and the first insulating element is disposed between the pole body and the first clamping element.

19. The battery cell according to claim 18, characterized in that, The insulating sealing structure includes a second insulating element, which is disposed on the outer side of the first clamping member away from the pole body and connected to the first insulating element.

20. The battery cell according to claim 19, characterized in that, The first insulating component and the second insulating component are integrally formed.

21. The battery cell according to claim 18, characterized in that, The insulating sealing structure includes a third insulating element, which is disposed on the side of the second clamping member near the electrode assembly and abuts against the sealing member.

22. The battery cell according to claim 21, characterized in that, The battery cell includes an insulating component, which is located on the inner side of the first wall and abuts against or connects to the third insulating component.

23. The battery cell according to any one of claims 1, 2, 5 to 8, 10 to 17, characterized in that, The housing assembly includes an outer shell and a cover plate, one end of the outer shell having an opening, the cover plate covering the opening, and the first wall being disposed on the outer shell or the cover plate.

24. The battery cell according to any one of claims 1, 2, 5 to 8, 10 to 17, characterized in that, The first wall is bent to form a protruding structure, which is arranged around the mounting hole.

25. The battery cell according to any one of claims 1, 2, 5 to 8, 10 to 17, characterized in that, The first clamping member and the second clamping member are insulated and sealed to the mounting hole. The second clamping member is bent to form a protruding structure, which is arranged around the mounting hole.

26. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 25.

27. An electrical appliance, characterized in that, Includes the battery cell as described in claim 26, or the battery cell as described in any one of claims 1 to 25.

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