Battery cell, battery and power-consuming device

Abstract

Battery cell, comprising the following: a housing body; an electrode clamp that is provided in the housing body; an electrode arrangement which is received in the housing body, wherein a first electrode tab is provided at one end of the electrode arrangement facing the electrode clamp; a collector component connected to the first electrode tab, wherein at least a part of the collector component is located on one side of the electrode clamp facing the first electrode tab and is in contact with and connected to the electrode clamp.

Description

Technical field

[0001] The present application relates to the technical field of batteries, in particular a battery cell, a battery and a power-consuming device. State of the art

[0002] Battery cells are widely used in electronic devices. Examples include mobile phones, laptops, electric cars, electric vehicles, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes, and power tools. Types of battery cells include cadmium-nickel battery cells, hydrogen-nickel battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells.

[0003] In the development of battery technology, improving the reliability of the battery cell is a research direction in battery technology. Registration content

[0004] The present application provides a battery cell, a battery and a power-consuming device, which can improve reliability.

[0005] According to a first aspect, an embodiment of the present application provides a battery cell comprising a housing body, an electrode clamp, an electrode assembly, and a collector component. The electrode clamp is provided on the housing body. The electrode assembly is received in the housing body, and a first electrode tab is provided at one end of the electrode assembly facing the electrode clamp. The collector component is connected to the first electrode tab, and at least a portion of the collector component is located on one side of the electrode clamp facing the first electrode tab and rests against and is connected to the electrode clamp.

[0006] In the above technical solution, at least part of the collector component is positioned on the side of the electrode clamp facing the first electrode tab, allowing the electrode clamp to rest against the collector component. If the electrode assembly wobbles, the electrode clamp can be limited by a side of the collector component facing away from the electrode assembly, thereby reducing the amplitude of the collector component's wobble, decreasing the risk of failure of the connection between the collector component and the electrode clamp, and improving the reliability of the battery cell.

[0007] In some embodiments, the collector component rests against and is connected to one of the end surfaces of the first electrode tab facing the electrode clamp.

[0008] The end face of the first electrode tab and the electrode clamp can clamp the collector component from both sides to keep both the first electrode tab and the electrode clamp in stable contact with the collector component, in order to reduce the oscillation of the collector component when the battery is subjected to an external shock, and to improve the reliability of the battery cell.

[0009] In some embodiments, the electrode clamps have a contact surface that rests against the collector component, where the diameter of the contact surface is D1; ​​the diameter of the collector component is D2, and the minimum thickness of the collector component is t1, where D1, D2, and t satisfy the following: t1 × D1 / D2 ≤ 0.4.

[0010] The larger the value of t1, the higher the strength of the collector component and the lower the probability of it deforming under pressure. If a gap forms between the electrode clamp and the collector component due to unevenness, the high strength of the collector component makes it difficult to deform when the electrode clamp and the collector component are pressed together. This prevents the collector component from fitting tightly against the electrode clamp, resulting in a larger gap between the collector component and the electrode clamp. By decreasing the value of t1, the strength of the collector component can be reduced, allowing it to deform adaptively under pressure and conform to the shape of the contact surface.

[0011] The larger the D1 / D2 ratio, the larger the required contact area between the collector component and the electrode clamp. If the collector component is uneven, the maximum gap between the electrode clamp and the collector component will also be larger. The higher the D1 / D2 value, the more difficult it is to reduce the gap by pressing the electrode clamps and the collector component together. Reducing the D1 / D2 value reduces the required contact area between the collector component and the electrode clamp, thus decreasing the gap and making it easier to press the two components together.

[0012] The above technical solution reduces the gap between the collector component and the electrode clamp and improves the connection strength between the collector component and the electrode clamp by limiting the value of t1×D1 / D2 to less than or equal to 0.4.

[0013] In some embodiments, D1, D2 and t1 satisfy the following: 0.05 ≤ t1×D1 / D2 ≤ 0.3.

[0014] The above technical solution reduces the gap between the collector component and the electrode terminal and improves the connection strength between them. If t1×D1 / D2 ≥ 0.05, the current flow capacity between the collector component and the electrode terminal can be improved, heat generation reduced, and the reliability and safety of the battery cell enhanced.

[0015] In some embodiments, t1 is between 0.1 mm and 1 mm.

[0016] The larger the value of t1, the higher the strength of the collector component and the lower the probability of it deforming under pressure. If a gap forms between the electrode clamp and the collector component due to unevenness, the high strength of the collector component makes it difficult to deform when the electrode clamp and the collector component are pressed together. This prevents the collector component from fitting tightly against the electrode clamp, resulting in a larger gap between the collector component and the electrode clamp. Conversely, the smaller the current-carrying area of ​​the collector component and the lower its current-carrying capacity.If the value of t1 is too small, this can lead to excessive heat generation in the collector component and impair the reliability and safety of the battery cell.

[0017] The above technical solution improves the current flow area of ​​the collector component, reduces the gap between the collector component and the electrode clamp, and improves the connection strength between the collector component and the electrode clamp by limiting t1 to 0.1 mm to 1 mm.

[0018] In some embodiments, t1 is between 0.2 mm and 0.6 mm.

[0019] The above technical solution further improves the current flow area of ​​the collector component, reduces the gap between the collector component and the electrode clamp, and improves the connection strength between the collector component and the electrode clamp.

[0020] In some embodiments, a surface of the electrode clamp that is closest to the electrode arrangement rests against the collector component in a thickness direction of the collector component.

[0021] When inserting the electrode assembly and the collector component into the housing, the collector component first contacts the surface of the electrode clamp that is closest to the electrode assembly. This can shorten the insertion path of the collector component into the housing and improve assembly efficiency.

[0022] In some embodiments, the electrode clamp comprises a boundary section and a first projection section, the boundary section being incorporated into the housing body. The boundary section overlaps at least partially with the housing body in the thickness direction of the collector component, with an upper end face of the first projection section being closer to the electrode assembly than the boundary section. The upper end face of the first projection section abuts the collector component.

[0023] In the above technical solution, the limiting section can be confined by the housing body to reduce the risk of the electrode terminals protruding from the housing body and to improve the reliability of the battery cell. The upper end face of the first protruding section extends beyond the limiting section, creating a gap between the limiting section and the collector component. This reduces the mating area between the collector component and the electrode terminal, and further reduces the gap between the collector component and the first protruding section, thereby improving the contact strength between the collector component and the electrode terminal.

[0024] In some embodiments, the first projection section protrudes from the boundary section by a dimension t2 of 0.05 mm to 0.35 mm in the thickness direction of the collector component.

[0025] The smaller t2 is, the higher the risk that the collector component and the boundary section will abut each other; if t2 is too small, the boundary section can impede the contact of the upper end face of the first projection section with the collector component. The larger t2 is, the greater the space occupied by the electrode terminals and the lower the space utilization within the battery cell. The above technical solution limits the value of t2 to between 0.05 mm and 0.35 mm, thereby reducing the risk of the boundary section abutting the collector component, decreasing the gap between the collector component and the upper end face of the first projection section, and reducing the space loss of the battery cell.

[0026] In some embodiments, t2 is between 0.15 mm and 0.25 mm.

[0027] The above technical solution can further reduce the risk of the limiting section touching the collector component, reduce the gap between the collector component and the upper end face of the first projection section, and reduce the space loss of the battery cell.

[0028] In some embodiments, an area of ​​the electrode clamp corresponding to the upper end face of the first projection section is welded to the collector component, forming a first weld section.

[0029] In the above technical solution, the upper end face of the first protrusion section rests directly against the collector component, and the gap between the two is small. Welding the electrode clamp and the area corresponding to the upper end face of the first protrusion section to the collector component reduces the risk of a cold weld and increases weld strength.

[0030] In some embodiments, the first weld section is annular, wherein an outer diameter of the first weld section is D3, wherein a diameter of the upper end face of the first projection section is D4, where D3 is smaller than D4.

[0031] During welding, defects can occur in the welding machine, leading to variations in the welding position. If D3 equals D4, these variations can cause welding to occur outside the upper end face of the first projection section, increasing the risk of a cold weld. The technical solution described above ensures that D3 is smaller than D4 to compensate for welding defects, reduce the risk of cold welds, and improve weld strength.

[0032] In some embodiments, the electrode clamp is provided on one side facing away from the first electrode tab with a first recess section, wherein a part between a bottom surface of the first recess section and the upper end surface of the first projection section forms a connecting section, wherein the connecting section is welded to the collector component and forms the first welded section.

[0033] In the above technical solution, by forming a first recess section on the electrode clamp to reduce the thickness of the connection section, the welding power required to weld the connection section to the collector component is reduced, heat generation is reduced, the risk of burning through other components is reduced, and safety is improved.

[0034] In some embodiments, the diameter of the bottom surface of the first projection section is D5, where the diameter of the upper end surface of the first projection section is D4, and D5 is smaller than D4.

[0035] Forming a first recess section reduces the thickness of the area where the electrode clamp faces the bottom surface of the first recess section, while the first projection section increases the thickness of the area where the electrode clamp faces the top surface of the first projection section. With a constant thickness of the connection section, and if D5 is greater than or equal to D4, process defects can cause a portion of the bottom surface of the first recess section to not face the top surface of the first projection section. This results in the local thickness of the electrode clamp being less than the thickness of the connection section, which in turn reduces the local strength of the electrode clamp and can lead to its failure if the battery cell is subjected to an external shock.The above technical solution ensures that D5 is smaller than D4 in order to reduce the influence of the first recess section on the strength of the electrode clamp, reduce the risk of electrode clamp breakage and improve the reliability of the battery cell.

[0036] In some embodiments, in the thickness direction of the collector component, the first projection section as a whole is closer to the electrode arrangement than the limiting section.

[0037] In some embodiments, the electrode clamp is provided with an annular recess section on one side facing the electrode assembly, the annular recess section being arranged around the first projection section. The annular recess section is recessed relative to the surface of the boundary section facing the electrode assembly and separates at least a portion of the boundary section from the first projection section.

[0038] In the above technical solution, the annular recess section can separate at least part of the boundary section from the first projection section in order to reduce the force transmitted to the boundary section when pressing the first projection section and to minimize the risk of deformation of the boundary section.

[0039] In some embodiments, the collector component is welded to the first electrode tab, forming a second weld section. This second weld section does not overlap the upper end face of the first projection section in the thickness direction of the collector component.

[0040] In the above technical solution, the second weld section and the upper end face of the first projection section do not overlap in the thickness direction. This reduces the risk of the upper end face of the first projection section contacting the second weld section, reduces the gap between the upper end face of the first projection section and the collector component, and improves weld strength.

[0041] In some embodiments, at least part of the second welding section is located on the side of the electrode clamp facing the first electrode tab and is spaced apart from the electrode clamp.

[0042] In the above technical solution, the second weld section is spaced away from the electrode clamp, thus reducing the risk of the second weld section interfering with the electrode clamp's contact with the collector component and preventing overpositioning. The second weld section can extend to the area of ​​the first electrode tab that is opposite the electrode clamp in the thickness direction, thereby improving current flow capability.

[0043] In some embodiments, the diameter of the collector component is D2, where the diameter of the upper end face of the first projection section is D4, where D4 / D2≤ 0.4.

[0044] The larger the ratio D4 / D2, the larger the contact area between the collector component and the upper end face of the first projection section must be. If the collector component has irregularities, the maximum gap between the upper end face of the first projection section and the collector component is also larger. The larger the value of D4 / D2, the more difficult it is to reduce the gap by pressing the electrode clamps and the collector component together. The above technical solution reduces the gap between the collector component and the first projection section and improves the connection strength between the collector component and the first projection section by ensuring that D4 / D2 ≤ 0.4.

[0045] In some embodiments, the collector component comprises a collector main body and a second projection section, wherein the collector main body is connected to the first electrode tab, wherein the second projection section extends from the surface of the collector main body facing the electrode clamp, wherein the upper end face of the second projection section rests against the electrode clamp, and wherein the collector main body and the electrode clamp are spaced apart from each other.

[0046] In the above technical solution, a second protruding section is provided on the collector component, creating a gap between the main collector body and the electrode clamp. This reduces the mating surface between the collector component and the electrode clamp, and consequently, the gap between the second protruding section and the collector component is reduced, thus improving the connection strength between the collector component and the electrode clamp.

[0047] In some embodiments, the second projection section extends from the main collector body by a dimension t3 of 0.05 mm to 0.25 mm in the thickness direction of the collector component.

[0048] The smaller t3 is, the higher the risk of the collector main body and the electrode clamp touching each other; if t3 is too small, the collector main body can impede the contact of the upper end face of the second projection section with the electrode clamp. The larger t3 is, the greater the space occupied by the collector component and the lower the space utilization within the battery cell. The above technical solution limits the value of t3 to between 0.05 mm and 0.25 mm, thereby reducing the risk of the collector main body touching the electrode clamp, decreasing the gap between the electrode clamp and the upper end face of the second projection section, and reducing the space loss within the battery cell.

[0049] In some embodiments, t3 is between 0.1 mm and 0.2 mm.

[0050] The above technical solution can further reduce the risk of the collector main body touching the electrode clamp, reduce the gap between the electrode clamp and the upper end face of the second projection section, and reduce the space loss of the battery cell.

[0051] In some embodiments, a portion of the collector body surrounding the outer surface of the second projection section is welded to the first electrode tab. During welding, the second projection section does not cover any portion of the collector body surrounding the outer surface of the second projection section. This reduces welding difficulty and minimizes welding effort.

[0052] In some embodiments, the diameter of the collector component is D2, where the diameter of the first projection section is L, and L / D2 ≤ 0.4.

[0053] The larger the L / D2 value, the larger the contact area between the electrode clamp and the upper end face of the second projection section must be. If the collector component has irregularities, the maximum gap between the upper end face of the second projection section and the electrode clamp is also larger. The larger the L / D2 value, the more difficult it is to reduce the gap by pressing the electrode clamps and the collector component together. The above technical solution reduces the gap between the electrode clamp and the second projection section and improves the connection strength between the electrode clamp and the second projection section by achieving an L / D2 value ≤ 0.4.

[0054] In some embodiments, the electrode clamp comprises a first projection section, wherein the upper end surface of the first projection section abuts the upper end surface of the second projection section.

[0055] In the above technical solution, a first protrusion section and a second protrusion section are provided, which further reduces the mating surface between the collector component and the electrode clamp, and the gap between the first protrusion section and the second protrusion section is thereby reduced, thus improving the connection strength between the collector component and the electrode clamp.

[0056] In some embodiments, the electrode clamp is provided with a second recessed section on a side facing the collector component. At least part of the second projecting section is received within the second recessed section, and an upper end face of the second projecting section rests against a bottom face of the second recessed section.

[0057] In the above technical solution, the second recess section can position the second recess section, thereby simplifying the assembly process of the electrode clamp and the collector component and improving assembly efficiency.

[0058] In some embodiments, the collector component further comprises a third projection section, wherein the third projection section protrudes from a surface of the collector main body facing the first electrode tab.

[0059] When assembling the electrode assembly and the collector component, the third protrusion section can be inserted into the first electrode tab by pressing the first electrode tab into the first electrode tab, thereby improving the stability of the contact between the first electrode tab and the collector component.

[0060] In some embodiments, the third projection section and the second projection section are arranged symmetrically around the main collector body.

[0061] The above technical solution can avoid errors because it eliminates the need to determine the orientation of the collector component when assembling the electrode arrangement and the collector component, thereby improving assembly efficiency.

[0062] In some embodiments, the collector component is provided with a third recess section at a position corresponding to the second projection section, wherein the third recess section is recessed relative to the surface of the collector body facing the first electrode tab. The third recess section can reduce the space required for the collector component and thus its weight.

[0063] In some embodiments, the electrode clamp is welded to the collector component. The melting point of the electrode clamp is T1, and the melting point of the collector component is T2, where T1 / T2 is between 0.8 and 1.1.

[0064] The above technical solution can reduce the difference between the melting point of the electrode clamp and the melting point of the collector component, improve the welding process and increase weld strength.

[0065] In some embodiments, the electrode clamp comprises a first recessed section and a connecting section located on the underside of the first recessed section; the collector component is welded to the connecting section, forming a first welded section; the first welded section extending at least to the interior of the collector component in the thickness direction of the collector component from the side of the connecting section facing away from the collector component.

[0066] In the above technical solution, by forming a first recess section on the electrode clamp to reduce the thickness of the connection section, the welding power required to weld the connection section to the collector component is reduced, heat generation is decreased, the risk of burning through other components is reduced, and safety is improved. The first weld section extends from the connection section into the interior of the collector component to join the collector component and the connection section. This reduces the contact resistance between the collector component and the electrode clamp and improves current flow capability.

[0067] In some embodiments, the housing body comprises a cylinder and a cover connected to the cylinder, the cylinder being arranged around an outer circumference of the electrode assembly, the cover being provided with an electrode exit hole, and the electrode clamp being installed in the electrode exit hole. The first weld section and the cover are both annular, with an outer diameter of the cover being D6 and an inner diameter of the first weld section being D7, where D6 and D7 satisfy the following: 0.1 ≤ D7 / D6 ≤ 0.6.

[0068] D6 correlates positively with the diameter of the electrode array. The larger D6, the higher the capacity of the electrode array and the higher the requirements for the current-carrying area of ​​the battery cell in the first welding section. The smaller D7, the smaller the circumference of the first welding section and the smaller its current-carrying area. If the D7 / D6 ratio is too small, an excessively large D6 and an excessively small D7 result in an insufficient current-carrying area in the first welding section. The first welding section generates a significant amount of heat during charging and discharging, which prevents the battery cell from meeting the requirements for current-carrying capacity and temperature rise during fast charging. The technical solution described above limits the D7 / D6 ratio to at least 0.1, thereby fulfilling the requirements for battery cells regarding current-carrying capacity and temperature rise.

[0069] The larger D7 is, the larger the electrode exit hole and the smaller the cover area. The smaller D6 is, the smaller the cover area. If D7 / D6 is too large, then D6 is too small and D7 too large, and the cover tends to deform under battery cell vibrations, posing a safety risk. The cover can serve as the battery cell's output end for connection to the current collection component. If the D7 / D6 ratio is too large, the contact area between the cover and the current collection component is too small, the current flow area between the cover and the current collection component is insufficient, and the heat generation at the connection point between the cover and the current collection component is too high, making it difficult to meet the requirements for current flow capacity and temperature rise of the battery cell during fast charging.The above technical solution limits D7 / D6 to less than or equal to 0.6, thereby meeting the requirements for battery cells regarding current flow capacity and temperature rise, thus increasing the safety of the battery cell.

[0070] In some embodiments, 0.2 ≤ D7 / D6 ≤ 0.4. If 0.2 ≤ D7 / D6 ≤ 0.4 is met, the requirements for battery cells regarding current flow capacity and temperature rise can be better met, which increases the safety of the battery cell.

[0071] In some embodiments, D7 is 5 mm to 14 mm.

[0072] If D7 is too small, this results in an insufficient current flow area in the first weld section. The first weld section generates a significant amount of heat during charging and discharging, which prevents the battery cell from meeting the requirements for current flow capacity and temperature rise during fast charging. If D7 is too large, the current flow area between the cover and the current collection component is insufficient, and the heat generation at the connection point between the cover and the current collection component is excessive. The above technical solution limits D7 to between 5 mm and 14 mm, thereby meeting the battery cell requirements regarding current flow capacity and temperature rise.

[0073] In some embodiments, the lid and the cylinder form a single molded structure. This eliminates the joining process between the lid and the cylinder.

[0074] The lid can serve as a connection point for external components. When the battery cell is subjected to external impacts, these external components can pull on the lid, thereby stressing the connection between the lid and the cylinder. In the above technical solution, the lid and cylinder are formed as a single piece, which improves the strength at the connection point between the lid and the cylinder and reduces the risk of connection failure between the lid and the cylinder.

[0075] In some embodiments, a dimension h of the first weld section is defined in the thickness direction of the collector component, where D8 is the thickness of the connection section; where D8 and h satisfy the following: 1 <h / D8≤ 1,5.

[0076] If h / D8 ≤ 1, the weld depth of the first weld section is shallow, and the first weld section forms as a single unit on the connecting section, resulting in a defective weld. The first weld section cannot effectively join the collector component and the connecting section. For a given value of D8, the power required for welding and the heat generated during the welding process increase with increasing h. If h is too high, the resulting high temperature during welding can easily damage the component around the electrode clamps, thus creating safety hazards. In the above technical solution, if 1 < h / D8 ≤ 1.5, the strength of the joint between the collector component and the connecting section can be improved, heat generation during welding can be reduced, and welding difficulties can be lessened.

[0077] In some embodiments, the thickness of a region of the collector component for welding to the connecting section D9, where D8 and D9 satisfy the following: 0.5 ≤ D9 / D8 ≤ 1.2.

[0078] The smaller D9 is for a given value of D8, the more easily the collector component melts through during the welding process, and the more easily the high-temperature particles generated during welding fall into the battery cell. Conversely, the larger D9 is, the greater the space requirement and weight of the collector component, and the lower the energy density of the battery cell. With the above technical solution, if 0.5 ≤ D9 / D8 ≤ 1.2 is satisfied, the risk of the collector component melting through and the loss of the battery cell's energy density can be reduced.

[0079] In some embodiments, D8 is 0.4 mm to 1.2 mm.

[0080] The smaller the value of D8, the lower the current-carrying capacity of the connection section. If D8 is too small, the connection section may not be able to meet the battery cell's requirements regarding current-carrying capacity and temperature rise during fast charging. As the value of D8 increases, so does the power required for welding and the heat generated during the welding process. If D8 is too large, the high temperature generated during welding can easily damage the component around the electrode clamps, thus creating safety hazards. The technical solution described above limits D8 to between 0.4 mm and 1.2 mm, thereby meeting the battery cell's requirements for current-carrying capacity and temperature rise, thus reducing heat generation during welding and increasing safety.

[0081] In some embodiments, the collector component is welded to the first electrode tab, forming a second weld section. The first electrode tab is arranged around a central axis of the electrode assembly, with the section of the first electrode tab perpendicular to the central axis being circular. An outer radius of the first electrode tab is R, with a minimum distance D between the second weld section and the central axis in the radial direction of the first electrode tab. 10 is, where D 10 and R must satisfy the following: 0.2 ≤ D 10 / R ≤ 0.8.

[0082] R is positively correlated with the diameter of the electrode array. The larger R is, the higher the current generated by the electrode array and the higher the requirements for the current-carrying area of ​​the battery cell. The part of the collector component near the central axis can be welded to the connecting section; the smaller D 10 The larger the value, the smaller the area of ​​the collector component that can be welded to the connecting section, and the smaller the current flow area between the collector component and the connecting section. Is D 10 / R too small, this leads to a D that is too small 10and an excessively large R leads to an insufficient current flow area between the collector component and the connection section. The weld between the collector component and the connection section generates a significant amount of heat during charging and discharging, which prevents the battery cell from meeting the requirements for current flow capacity and temperature rise during fast charging. The above technical solution meets the battery cell requirements regarding current flow capacity and temperature rise by... 10 / R ≥ 0.2 is fulfilled.

[0083] The first electrode tab typically comprises several electrode tab layers. The larger the D 10 The further out the electrode plate layer lies, the more directly it is connected to the second weld section. Is D 10If the electrode gap is too large, this results in fewer electrode plate layers connected to the second welding section and a greater distance between the second welding section and the innermost electrode plate layer. This leads to a greater difference between the current path between the outermost electrode plate layer and the electrode clamp and the current path between the innermost electrode plate layer and the electrode clamp. This results in an uneven current density of the first electrode foil of the electrode assembly and an increased internal resistance. The above technical solution ensures that D 10 / R≤ 0.8, which reduces the difference in the current path between different positions of the first electrode tab and the electrode clamp, improves the uniformity of the current density of the first electrode foil of the electrode arrangement, reduces the internal resistance and increases the current flow capability.

[0084] In some embodiments, D 10 and R as follows: 0.2 ≤ D 10 / R≤ 0.5.

[0085] The above technical solution can improve the current flow capability of battery cells and reduce the temperature rise of battery cells.

[0086] In some embodiments, D is 10 3.5mm to 10mm.

[0087] Is D 10 If the weld area is too small, this results in an insufficient current flow area between the collector component and the connection section. The weld between the collector component and the connection section generates a significant amount of heat during charging and discharging, which prevents the battery cell from meeting the requirements for current flow capacity and temperature rise during fast charging. The above technical solution meets the battery cell requirements regarding current flow capacity and temperature rise by... 10 ≥ 3.5 mm must be met.

[0088] Is D 10 If the electrode plate layer is too large, this results in fewer electrode plate layers connected to the second weld section and an excessively large distance between the electrode plate layer near the central axis and the second weld section. This leads to a higher internal resistance of the electrode assembly and impairs the performance of the battery cell. The above technical solution ensures that D 10 ≤ 10 mm, which reduces the internal resistance of the electrode arrangement and improves the charging and discharging performance of the battery cell.

[0089] In some embodiments, the diameter of the collector component is D2, wherein the diameter of the first electrode tab is D. 11 is, where D2 is smaller than D 11 The collector component has a smaller diameter, which saves space and weight of the collector component and increases the energy density of the battery cell.

[0090] In some embodiments, D2 and D fulfill 11 The following: 0.75 ≤ D2 / D 11 ≤ 0.97.

[0091] If D2 at a certain value of D 11 If the distance between the outer part of the first electrode tab and the collector component is too large, the conductive path between the outer part of the first electrode tab and the collector component is too long. This leads to a high internal resistance of the electrode assembly and impairs the performance of the battery cell. The above technical solution ensures that D2 / D 11 ≥ 0.75, which reduces the internal resistance of the electrode arrangement and improves the charging and discharging performance of the battery cell.

[0092] If D2 at a certain value of D 11If the housing is too small, the coaxiality of the collector component and the electrode assembly fluctuates due to assembly errors. This causes the collector component to protrude beyond the outer circumferential surface of the electrode assembly. This makes it difficult to insert the collector component and the electrode assembly into the housing, thus impairing assembly efficiency and product yield. The above technical solution ensures that D2 / D 11 ≤ 0.97, which reduces the risk of the collector component protruding beyond the outer circumferential surface of the electrode assembly due to defects, and improves assembly efficiency and product yield.

[0093] In some embodiments, D2 is 35 mm to 44 mm.

[0094] The above technical solution limits D2 to 35 mm to 44 mm, thereby reducing the internal resistance of the electrode assembly, improving the charging and discharging performance of the battery cell, and reducing the risk of the collector component protruding beyond the outer circumferential surface of the electrode assembly due to a fault.

[0095] According to a second aspect, embodiments of the present application provide a battery comprising several battery cells according to one of the embodiments of the first aspect.

[0096] According to a third aspect, the embodiments of the present application provide a power-consuming device comprising a battery according to the second aspect, wherein the battery is used to provide electrical energy. Brief description of the drawings

[0097] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings, which are to be used in the embodiments of the present application, are briefly described below. Of course, the accompanying drawings described below are only some of the embodiments of the present application, and other accompanying drawings can be derived from the accompanying drawings by a person with normal technical knowledge without any creative effort. Fig. Figure 1 shows a schematic representation of the structure of a vehicle according to some embodiments of the present application; Fig. Figure 2 shows a schematic exploded view of a battery according to some embodiments of the present application; Fig. Figure 3 shows a schematic representation of the structure of a battery module according to Fig. 2; Fig. Figure 4 shows a schematic exploded view of the battery cell according to some embodiments of the present application; Fig. 5 shows a schematic sectional view of the battery cell according to some embodiments of the present application; Fig. Figure 6 shows a partially enlarged schematic representation of the battery cell of Fig. 5; Fig. Figure 7 shows an enlarged schematic representation of Fig. 6 in field B; Fig. Figure 8 shows an enlarged schematic representation of Fig. 7 in field C; Fig. Figure 9 shows a schematic representation of the structure of an electrode arrangement of the battery cell according to some embodiments of the present application; Fig. Figure 10 shows a schematic local sectional view of the battery cell according to some other embodiments of the present application; Fig. Figure 11 shows a schematic cross-sectional view of the in Fig. 10 electrode clamps shown; Fig. Figure 12 shows a schematic cross-sectional view of the in Fig. 10 collector components shown; Fig. Figure 13 shows an enlarged schematic representation of Fig. 12 in field E; Fig. Figure 14 shows a schematic local sectional view of the battery cell according to some other embodiments of the present application; Fig. Figure 15 shows a schematic cross-sectional view of the in Fig. 14 electrode clamp shown; Fig. Figure 16 shows a schematic cross-sectional view of the in Fig. 14 collector component shown; Fig. Figure 17 shows a schematic local sectional view of the battery cell according to some other embodiments of the present application; Fig. Figure 18 shows an enlarged schematic representation of Fig. 17 in field F; Fig. Figure 19 shows a schematic sectional view of the battery cell according to some other embodiments of the present application. Description of the embodiments

[0098] To clarify the objectives, technical solutions, and advantages of the embodiments presented in this application, the technical solutions of the embodiments are described in detail below with reference to the accompanying drawings. The described embodiments represent, of course, some, but not all, embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of protection of this application.

[0099] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings commonly understood by a person skilled in the art in the field of this application; the terminology used in the description of this application serves solely to describe specific embodiments and is not intended to limit the application; the terms "comprising" and "with" and all variations thereof in the description, claims, and foregoing drawings of this application are intended to include non-exclusive inclusion. The terms "firstly," "secondly," etc., in the description, claims, or accompanying drawings of this application serve to distinguish between different objects and not to describe a particular sequence or a primary / secondary relationship.

[0100] The reference to "embodiment" here means that a particular feature, structure, or property described in connection with the embodiments may be included in at least one embodiment of the present application. The occurrence of this expression at different points in the description does not necessarily always refer to the same embodiment, nor is it an independent or alternative embodiment that excludes other embodiments.

[0101] The description of this application should point out that the terms "installation", "connection", "link", and "connection" are to be interpreted broadly, unless expressly stated otherwise and limited. They may, for example, denote a fixed, detachable, or inseparable connection; they may denote a direct or indirect connection via an intermediate medium; and they may denote the internal connection of two components. Those skilled in the art will be able to understand the precise meaning of the above terms in this application from the specific circumstances.

[0102] In this application, the term "and / or" merely describes the relationship between related objects and indicates that three relationships are possible. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the symbol " / " in this application generally indicates that the objects preceding and following it are in an "or" relationship.

[0103] In the embodiments of this application, the same reference numerals denote the same parts, and for the sake of brevity, detailed descriptions of the same parts in the various embodiments are omitted. It is 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 examples and are not intended to limit this application.

[0104] The term “plurality”, as used in the present application, refers to more than two (including two).

[0105] In the present application, the term "parallel" encompasses not only the case of absolute parallelism, but also the case of approximate parallelism in the technical sense; likewise, the term "perpendicular" encompasses not only the case of absolute right angles, but also the case of approximate right angles in the technical sense.

[0106] In the present application, the battery cell may comprise a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application are not limited thereto.

[0107] The batteries mentioned in the embodiments of the present application may comprise one or more battery cells to achieve a higher voltage and capacity. For example, the battery mentioned in this application may comprise a battery module or a battery pack. A battery typically consists of a casing for holding one or more battery cells. The casing prevents liquids or other foreign matter from interfering with the charging or discharging of the battery cells.

[0108] The battery cell comprises an electrode assembly and an electrolyte solution. The electrode assembly includes a cathode foil, an anode foil, and a separator. The battery cell functions primarily through the movement of metal ions between the cathode foil and the anode foil. The cathode foil comprises a cathode collector and an active cathode material layer. The active cathode material layer is coated on the surface of the cathode collector. The cathode collector comprises a cathode collector section and a cathode tab. The active cathode material layer is coated on the cathode collector section, while the cathode tab is not coated with an active cathode material layer.In a lithium-ion battery, the cathode collector material can be, for example, aluminum; the active cathode material layer comprises an active cathode material, and the active cathode material can be lithium cobaltate, lithium iron phosphate, lithium ternary, lithium manganate, or the like. The anode foil comprises an anode collector and an active anode material layer; the active anode material layer is coated on the surface of the anode collector; the anode collector comprises an anode collector section and an anode tab; the active anode material layer is coated on the anode collector section; the anode tab is not coated with an active anode material layer. The anode collector material can be copper; the active anode material layer comprises an active anode material, and the active anode material can be carbon, silicon, or the like.The separator material can be PP (polypropylene) or PE (polyethylene) and the like.

[0109] The battery cell further comprises a housing body for receiving the electrode assembly and the electrode terminals provided on the housing body. The electrode terminals serve to electrically connect the electrode assembly to enable charging and discharging. To simplify assembly and ensure the current flow capability of the battery cells, the battery cells are typically connected to the electrode tabs and electrode terminals of the electrode assembly via the collector component.

[0110] When a battery cell is subjected to an external shock, the electrode assembly inside the casing can wobble up and down. The inventor notes that when the electrode assembly wobbles, other collector components are also moved, leading to deformation of the collector component and increasing the risk of a connection failure between the collector component and the electrode terminals.

[0111] In light of this, an embodiment of the present application presents a technical solution in which at least part of the collector component is provided on a side of the electrode clamp facing the electrode tab, so that the electrode clamp can bear against the collector component. If the electrode assembly wobbles, the electrode clamp can be limited by a side of the collector component facing away from the electrode assembly, thereby reducing the amplitude of the wobble of the collector component, decreasing the risk of failure of the connection between the collector component and the electrode clamp, and improving the reliability of the battery cell.

[0112] The technical solutions described in the embodiments of the present application are all applicable to batteries and power-consuming devices that use batteries.

[0113] The power-consuming devices may include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, power tools, and the like. The vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle, where the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extended vehicle, and the like. The spacecraft includes aircraft, rockets, space shuttles, spacecraft, and the like. The electric toy includes stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, electric airplane toys, and the like.The power tools include power tools for metalworking, grinding tools, assembly tools, and power tools for the railway sector, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and the like. The embodiments of the present application are not subject to any particular restrictions with regard to the aforementioned electrical devices.

[0114] For the sake of simplicity, the following exemplary embodiments are presented using the power-consuming device as an example of a vehicle.

[0115] Fig. Figure 1 shows a schematic representation of the structure of a vehicle according to some embodiments of the present application. As in Fig. As shown in Figure 1, vehicle 1 is equipped with a battery 2 inside. The battery 2 can be located on the underside, at the front, or at the rear of vehicle 1. The battery 2 can be used to power vehicle 1; for example, the battery 2 can be used as the operating power source for vehicle 1.

[0116] The vehicle 1 may further comprise a control unit 3 and a motor 4, wherein the control unit 3 serves to control the battery 2 in order to supply energy to the motor 4, e.g. for the operating energy requirements of the vehicle 1 for starting, navigating and driving.

[0117] In some embodiments of the present application, the battery 2 can be used not only as an operating energy source for the vehicle 1, but also as a propulsion energy source for the vehicle 1, instead of or partially instead of heating oil or natural gas to provide propulsion energy for the vehicle 1.

[0118] Fig. Figure 2 shows a schematic exploded view of a battery according to some embodiments of the present application. As in Fig. As shown in Figure 2, battery 2 comprises a box 5 and a battery cell (in Fig. 2 not shown), with the battery cell being housed in box 5.

[0119] The box 5 serves to hold the battery cells, and the box 5 can have various structures. In some embodiments, the box 5 can comprise a first box section 5a and a second box section 5b, wherein the first box section 5a and the second box section 5b cover each other and the first box section 5a and the second box section 5b together define a receiving space 5c for holding the battery cells.The second box section 5b can be a hollow structure with an opening at one end, the first box section 5a is a plate-shaped structure, and the first box section 5a covers one opening side of the second box section 5b to form a box 5 with the receiving space 5c. Both the first box section 5a and the second box section 5b can also be hollow structures with an opening on one side, with the opening side of the first box section 5a covering the opening side of the second box section 5b to form the box 5 with a receiving space 5c. Naturally, the first box section 5a and the second box section 5b can have different structures, such as cylindrical, rectangular, and the like.

[0120] To improve the sealing of the first box section 5a and the second box section 5b when they are connected, a sealing element, such as a sealant, a sealing ring and the like, may also be provided between the first box section 5a and the second box section 5b.

[0121] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be referred to as the upper box lid, and the second box section 5b can also be referred to as the lower box body.

[0122] Battery 2 can contain one or more battery cells. If there are multiple battery cells, they can be connected in series, parallel, or in a mixed circuit, where a mixed circuit means that the multiple battery cells are connected in both series and parallel. The multiple battery cells can be connected directly in series, parallel, or in a mixed circuit, and then the entire assembly formed by the multiple battery cells is housed in box 5. Alternatively, the multiple battery cells can first be connected in series, parallel, or in a mixed circuit to form a battery module 6, and then the multiple battery modules 6 can be connected in series, parallel, or in a mixed circuit to form a complete assembly, which is then housed in box 5.

[0123] Fig. Figure 3 shows a schematic representation of the structure of a battery module according to Fig. 2.

[0124] In some embodiments, such as in Fig. As shown in Figure 3, there are multiple battery cells 7, and these multiple battery cells 7 are initially connected in series, parallel, or in a mixed circuit to form a battery module 6. The multiple battery modules 6 are then connected in series or parallel in a mixed circuit to form a whole and are enclosed in the box.

[0125] The multiple battery cells 7 in the battery module 6 can be electrically connected to one another by means of a current collection component 8 to enable a parallel, series, or mixed connection of the multiple battery cells 7 in the battery module 6. The current collection components can be one or more, with each current collection component 8 serving to electrically connect at least two battery cells.

[0126] Fig. Figure 4 shows a schematic exploded view of the battery cell according to some embodiments of the present application; Fig. 5 shows a schematic sectional view of the battery cell according to some embodiments of the present application; Fig. Figure 6 shows a partially enlarged schematic representation of the battery cell of Fig. 5.

[0127] As in Fig. 4, Fig. 5 to Fig. Figure 6 shows an embodiment of the present application providing a battery cell 7 comprising a housing body 20, an electrode terminal 30, an electrode arrangement 10, and a collector component 40. The electrode terminal 30 is provided on the housing body 20. The electrode arrangement 10 is received in the housing body 20, and a first electrode tab 11 is provided at one end of the electrode arrangement 10 facing the electrode terminal 30. The collector component 40 is connected to the first electrode tab 11. At least a portion of the collector component 40 is located on one side of the electrode terminal 30 facing the first electrode tab 11 and rests against and is connected to the electrode terminal 30.

[0128] The electrode assembly 10 comprises a first electrode foil and a second electrode foil with opposite polarity. One of the first and second electrode foils is the cathode foil, and the other is the anode foil. For example, the electrode assembly 10 generates electrical energy through oxidation and reduction reactions during the incorporation of ions into, and / or the extraction of ions from, the cathode foil and the anode foil(s). Optionally, the electrode assembly 10 further comprises a separator, which serves to isolate and separate the first electrode foil from the second electrode foil.

[0129] In some examples, the first electrode foil, the second electrode foil, and the separator are all strip structures, and the first electrode foil, the second electrode foil, and the separator are wound together around the central axis A to form a wound structure. The wound structure can be cylindrical, flat, or of another shape. In other examples, the electrode arrangement 10 can also be a stacked structure formed from the first electrode foil, the separator, and the second electrode foil by a stacked arrangement.

[0130] The first electrode tab 11 is a section of the first electrode foil that is not coated with the active material layer. The first electrode tab 11 can be the cathode tab or the anode tab.

[0131] The housing body 20 is a hollow structure with an interior space for receiving the electrode assembly 10. The housing body 20 can have various shapes and sizes, for example, cuboid, cylindrical, or hexagonal prisms. The shape of the housing body 20 can be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 has a cylindrical structure, a cylindrical housing body can be selected; if the electrode assembly 10 has a rectangular structure, a rectangular housing body can be selected. Optionally, both the electrode assembly 10 and the housing body 20 can have a cylindrical structure.

[0132] The housing body 20 can be made of various materials, e.g. copper, iron, aluminium, stainless steel, aluminium alloys, etc., and the embodiments of the present application do not provide for any particular restrictions in this regard.

[0133] The housing body 20 can be positively charged, negatively charged, or uncharged.

[0134] The electrode terminal 30 can serve as an output electrode of the battery cell 7, which can electrically connect the battery cell 7 to an external circuit to enable charging and discharging of the battery cell 7. Optionally, the electrode terminal 30 can be used to establish a connection to the current collection component, thus creating an electrical connection between the battery cells 7.

[0135] The electrode terminal 30 can be provided insulated on the housing body 20 or electrically connected to the housing body 20. This embodiment of the present application does not restrict this, as long as the cathode foil and the anode foil are non-conductive.

[0136] The collector component 40 electrically connects the first electrode tab 11 to the electrode clamp 30. The embodiments of this application do not restrict the connection method between the first electrode tab 11 and the collector component 40. For example, the collector component 40 can be connected to the first electrode tab 11 by welding, crimping, or gluing.

[0137] The embodiments of this application do not restrict the connection method between the collector component 40 and the electrode clamp 30. For example, the collector component 40 can be connected to the first electrode clamp 30 by welding, crimping, or gluing.

[0138] At least part of the collector component 40 is located between the first electrode tab 11 and the electrode clamp 30. The collector component 40 can be arranged as a whole between the first electrode tab 11 and the electrode clamp 30 or only partially between the first electrode tab 11 and the electrode clamp 30.

[0139] In the embodiments of the present application, at least a portion of the collector component 40 is provided on a side of the electrode clamp 30 facing the electrode tab 11, so that the electrode clamp 30 can bear against the collector component 40. If the electrode assembly 10 wobbles, the electrode clamp 30 can be limited by a side of the collector component 40 facing away from the electrode assembly 10, thereby reducing the amplitude of the wobble of the collector component 40, decreasing the risk of failure of the connection between the collector component 40 and the electrode clamp 30, and improving the reliability of the battery cell 7.

[0140] In some embodiments, the electrode arrangement 10 comprises a main body section 12, a first electrode tab 11, and a second electrode tab 13, wherein the first electrode tab 11 and the second electrode tab 13 project from the main body section 12. For example, the first electrode tab 11 is a section of the first electrode foil that is not coated with the active material layer, and the second electrode tab 13 is a section of the second electrode foil that is not coated with the active material layer.

[0141] The first electrode tab 11 and the second electrode tab 13 can extend from the same side of the main body section 12, or they can extend from opposite sides. For example, the first electrode tab 11 is located at one end of the electrode assembly 10 facing the electrode clamp 30, and the second electrode tab 13 is located at one end of the electrode assembly 10 facing away from the electrode clamp 30.

[0142] In some embodiments, the first electrode tab 11 is wound in a plurality of turns around the central axis of the electrode arrangement 10; in other words, the first electrode tab 11 comprises a plurality of turns of the electrode tab layer. After completion of the winding, the first electrode tab 11 essentially has the shape of a column, and a gap remains between two adjacent turns of the electrode tab layer. The embodiments of the present application can treat the first electrode tab 11 such that the gap between the electrode tab layers is reduced in order to facilitate the connection of the first electrode tab 11 to the collector component 40.For example, the embodiments of the present application can perform a kneading treatment on the first electrode tab 11 in order to close and join the end section of the first electrode tab 11 facing away from the main body section 12; the kneading treatment creates a dense end surface 111 at the end of the first electrode tab 11 facing away from the main body section 12, reduces the gap between the electrode tab layers and facilitates the connection of the first electrode tab 11 to the collector component 40. Alternatively, the embodiments of the present application can also fill the electrically conductive material between two adjacent windings of the electrode tab layers in order to reduce the gap between the electrode tab layers.

[0143] In some embodiments, the second electrode tab 13 is wound in a plurality of turns around the central axis of the electrode arrangement 10, and the second electrode tab 13 comprises a plurality of turns of the electrode tab layer. For example, the second electrode tabs 13 are also kneaded to reduce the gap between the electrode tab layers of the second electrode tab 13.

[0144] The central axis A of the electrode arrangement 10 is a virtual straight line. The first electrode tab, the second electrode tab, and the separator can be wound with the central axis A as a reference point.

[0145] In some embodiments, the housing body 20 comprises a cylinder 21 and a cover 22 connected to the cylinder 21, wherein the cylinder 21 is arranged around an outer circumference of the electrode arrangement 10, wherein the cover 22 is provided with an electrode outlet hole 221, and wherein the electrode clamp 30 is installed in the electrode outlet hole 221.

[0146] The cover 22 and the cylinder 21 can be formed as a single piece, i.e., the housing body 20 is a single component. Of course, the cover 22 and the cylinder 21 can also consist of two separate components that are then joined together by welding, riveting, gluing, or similar methods.

[0147] The electrode exit hole 221 penetrates the cover 22 to allow electrical energy to be guided out of the housing body 20 from the electrode arrangement 10.

[0148] The central axis A of the electrode arrangement is a virtual straight line and passes through the electrode exit hole 221. The central axis A of the electrode arrangement 10 may or may not coincide with the axis of the electrode exit hole 221.

[0149] The electrode clamp 30 serves to interact with the electrode outlet hole 221 to cover it. The electrode clamp 30 may or may not project into the electrode outlet hole 221. The electrode clamp 30 is attached to the cover 22. The electrode clamp 30 may be attached to the outside of the cover 22 as a whole, or it may extend through the electrode outlet hole 221 into the interior of the housing body 20.

[0150] In some embodiments, the cover 22 and the cylinder 21 form a single-piece molded structure. This eliminates the joining process between the cover 22 and the cylinder 21.

[0151] When the cover 22 and the cylinder 21 are electrically connected to the cathode or the anode of the electrode assembly 10, the resistance at the junction between the cover 22 and the cylinder 21 is low because the junction between the cover 22 and the cylinder 21 is a single-piece structure, thus improving current flow. The cover 22 can serve for connection to external components (e.g., a current collection component). When the battery cell 7 is subjected to external shocks, these external components can pull on the cover 22 and thereby stress the junction between the cover 22 and the cylinder 21. In the above technical solution, the cover 22 and the cylinder 21 are formed as a single piece, which improves the strength at the junction between the cover 22 and the cylinder 21 and reduces the risk of junction failure.

[0152] In some embodiments, the housing body 20 can be formed by a stretching process.

[0153] In some embodiments, the housing body 20 has an opening 23 at an end facing away from the electrode terminal 30, and the battery cell 7 further comprises a cover plate 50 for closing the opening.

[0154] In particular, the cylinder 21 has an opening 23 at one end facing away from the cover 22, with the cover plate 50 covering the opening of the cylinder 21 in order to close the opening 23 of the cylinder 21. The cover plate 50 can have various structures; for example, the cover plate 50 can be a plate-like structure.

[0155] In some embodiments, the cover plate 50 can be a circular, rectangular, square, hexagonal or other shaped cover cap.

[0156] In some embodiments, the cover plate 50 is welded to the cylinder 21.

[0157] In some embodiments, the cover 22 is circular and the electrode arrangement 10 is cylindrical; the central axis A may coincide with the axis of the electrode exit hole 221. In this embodiment, it is not necessary for the central axis A to coincide completely with the axis of the electrode exit hole 221; a process-related deviation between the two is permissible.

[0158] In this embodiment, the electrode exit hole 221 is typically located in the center of the cover 22, and accordingly, the electrode clamp 30 is also installed in the center of the cover 22. If several battery cells 7 are grouped together, the requirements for the positioning accuracy of the electrode clamps 30 can be reduced and the assembly process simplified.

[0159] For example, the axis of the electrode exit hole 221 coincides with the axis of the cover 22, and the cover 22 is a ring-shaped structure arranged around the axis of the electrode exit hole 221.

[0160] For example, the axis of the electrode clamp 30 coincides with the axis of the electrode exit hole 221.

[0161] In some other embodiments, the cover 22 can also be rectangular and the electrode arrangement 10 flat. The electrode exit hole 221 can be provided near an end section of the cover 22 along its own longitudinal direction.

[0162] In some embodiments, the electrode arrangement 10 further comprises a second electrode tab 13 with opposite polarity to the first electrode tab 11, wherein the second electrode tab 13 is arranged about a central axis A of the electrode arrangement 10. The first electrode tab 11 is provided at one end of the electrode arrangement 10 facing the electrode clamp 30, and the second electrode tab 13 is provided at one end of the electrode arrangement 10 facing away from the electrode clamp 30, wherein the second electrode tab 13 is electrically connected to the housing body 20.

[0163] The housing body 20 itself can serve as an output electrode of the battery cell 7, thus eliminating the need for a conventional electrode clamp 30 and simplifying the structure of the battery cell 7. If several battery cells 7 are grouped together, the housing body 20 can be electrically connected to the current collection component, thereby increasing the current flow area and allowing for a more flexible structural design of the current collection component.

[0164] In some embodiments, the second electrode tab 13 is the anode tab, and the base material of the housing body 20 is made of steel. The housing body 20 is electrically connected to the anode tab, meaning that the housing body 20 is in a low-potential state. In this low-potential state, the steel housing body 20 is not easily corroded by the electrolyte solution.

[0165] In some embodiments, the cylinder 21 serves to connect the second electrode tab 13 and the cover 22 in such a way that the second electrode tab 13 and the cover 22 are electrically connected to each other.

[0166] The cylinder 21 can either be directly electrically connected to the second electrode tab 13 or electrically connected to the second electrode tab 13 via other components. For example, the second electrode tab 13 is electrically connected to the cylinder 21 via the cover 50.

[0167] The cover 22 and the electrode terminal 30 have opposite polarities. In this case, either the cover 22 or the electrode terminal 30 can serve as a positive output electrode of the battery cell 7, or the other can serve as a negative output electrode of the battery cell 7. In this embodiment, the positive output terminal and the negative output terminal are located on the same side of the battery cell 7, which simplifies the connection process between multiple battery cells 7.

[0168] In this embodiment of the present application, the electrode exit hole 221 is formed after stretching and shaping the housing body 20.

[0169] The inventors attempted to roll the open end of the cylinder in such a way that it folded inwards, forming a flap structure. This flap structure presses against the cover plate to secure it. The inventor installed the electrode clamps on the cover plate and used the flap structure and the electrode clamps as the two output electrodes of the battery cell. However, the larger the flap structure, the greater the risk of deformation and wrinkling after the forming process. Deformation and wrinkling of the flap structure lead to surface irregularities, which in turn impair the weld quality when the flap structure is welded to the external current-collecting components. Therefore, the dimensions of the flap structure are relatively limited, resulting in insufficient current-carrying capacity of the battery cells.

[0170] In this embodiment, the electrode exit hole 221 for installing the electrode clamp 30 is formed in the cover 22 by means of an opening process, such that the positive and negative output electrodes are located at opposite ends of the battery cell 7, away from the opening of the cylinder 21. The cover 22 is formed during the molding process of the housing body 20. The formation of the electrode exit hole 221 ensures flatness and a secure connection between the cover 22 and the current collection component. The flatness of the cover 22 is not limited by its own dimensions, allowing the cover 22 to be larger, thereby improving the current flow capacity of the battery cell 7.

[0171] In some embodiments, the collector component 40 rests against and is connected to one of the end surfaces 111 of the first electrode tab 11 facing the electrode clamp 30.

[0172] The end surface 111 of the first electrode tab 11 and the electrode clamp 30 can clamp the collector component 40 from both sides to keep both the first electrode tab 11 and the electrode clamp 30 in stable contact with the collector component 40, in order to reduce the oscillation of the collector component 40 when the battery 7 is subjected to an external shock, and to improve the reliability of the battery cell 7.

[0173] For example, along the thickness direction Z of the collector component 40, the first electrode tab 11 and the electrode clamp 30 are provided on both sides of the collector component 40.

[0174] In some embodiments, during the assembly of the battery cell 7, the first electrode tab 11 of the electrode assembly 10 can first be welded to the collector component 40, and then the electrode assembly 10 and the collector component 40 can be inserted into the housing body 20. In particular, during welding, the collector component 40 can be pressed against the flattened end surface 111 of the first electrode tab 11, and then an external welding device emits a laser onto the surface of the collector component 40 facing away from the first electrode tab 11, and the laser welds the collector component 40 and the first electrode tab 11 together.

[0175] Fig. Figure 7 shows an enlarged schematic representation of Fig. 6 in field B; Fig. Figure 8 shows an enlarged schematic representation of Fig. 7 in field C; Fig. Figure 9 shows a schematic representation of the structure of an electrode arrangement of the battery cell according to some embodiments of the present application.

[0176] With reference to Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 to Fig. 9. In some embodiments, the electrode clamp 30 has a contact surface 30a that rests against the collector component 40. The contact surface 30a is the area where the outer surface of the electrode clamp 30 is in contact with the collector component 40.

[0177] The embodiments of the present application do not restrict the shape of the contact surface 30a. For example, the contact surface 30a can be square, circular, trapezoidal, or other shapes. The contact surface 30a can be a flat or a curved surface.

[0178] In some embodiments, the contact surface 30a is a circular surface. In the embodiments of the present application, the circle refers to the outer contour of the contact surface 30a. In other words, the contact surface 30a can be a solid circular surface or a hollow circular surface (i.e., the contact surface 30a can be an annular surface).

[0179] For example, the contact surface 30a is a circular plane.

[0180] The diameter of the contact surface 30a is D1. If, for example, the contact surface 30a is an annular surface, D1 denotes the outer diameter of the annular surface.

[0181] In some embodiments, the collector component 40 can be circular, rectangular or another shape.

[0182] In some embodiments, the collector component 40 is circular. The circle refers to the outer contour of the collector component 40. In the thickness direction Z of the collector component 40, the projection of the collector component 40 is a circle.

[0183] In some embodiments, the diameter of the collector component is D2, and the minimum thickness of the collector component 40 is t1, where D1, D2 and t1 satisfy the following: t1×D1 / D2≤0.4.

[0184] The first electrode tab 11 is relatively soft. After flattening or other processing, the end surface 111 of the first electrode tab 11 may exhibit a flatness deviation. Similarly, due to limitations in the manufacturing process, a flatness deviation may also occur in the surface of the collector component 40 that rests against the electrode clamp 30.

[0185] When the electrode clamp 30 and the collector component 40 are in contact, a small gap may exist between the contact surface of the electrode clamp 30 and the collector component 40 due to the flatness deviation of the end surface 111 of the first electrode tab 11 and the flatness deviation of the surface of the collector component 40. If the gap is too large, this will impair the connection strength between the electrode clamp 30 and the collector component 40. For example, the electrode clamp 30 and the collector component 40 can be joined by welding; if the gap between the electrode clamp 30 and the collector component 40 is too large, there is a risk of cold welds.

[0186] During assembly, the inventor attempted to squeeze the electrode clamp 30 and the collector component 40 together to reduce the gap between the two.

[0187] The inventor determined that D1, D2 and t1 all influence the fit between the electrode clamp 30 and the collector component 40.

[0188] In particular, the larger the value of t1, the higher the strength of the collector component 40 and the lower the probability that the collector component 40 will deform under pressure. If a gap forms between the electrode clamp 30 and the collector component 40 due to unevenness, the collector component 40 will be difficult to deform when the electrode clamp 30 and the collector component 40 are pressed together if the value of t1 is too large due to its high strength. As a result, the collector component 40 cannot fit tightly against the electrode clamp 30, leading to a larger gap between the collector component 40 and the electrode clamp 30.

[0189] By reducing the value of t1, the strength of the collector component 40 can be reduced, allowing the collector component 40 to adaptively deform under pressure and adapt to the shape of the contact surface 30a.

[0190] The larger the ratio D1 / D2, the larger the contact area between the collector component 40 and the electrode clamp 30 must be. If the collector component 40 has irregularities, the maximum gap between the electrode clamp 30 and the collector component 40 is also larger. The larger the value of D1 / D2, the more difficult it is to reduce the gap by pressing the electrode clamps 30 and the collector component 40 together.

[0191] By reducing the value of D1 / D2, the contact area between the collector component 40 and the electrode clamp 30 can be reduced, the gap between the electrode clamp 30 and the collector component 40 can be reduced, and the difficulty of pressing the collector component 40 and the electrode clamp 30 together can be reduced.

[0192] After extensive research and numerous experiments, the inventor found that limiting the value of t1×D1 / D2 to less than or equal to 0.4 reduces the gap between the collector component 40 and the electrode terminal 30 and improves the connection strength between the collector component 40 and the electrode terminal 30.

[0193] In some embodiments, t1×D1 / D2≤0.3.

[0194] After extensive research and numerous experiments, the inventor found that when t1×D1 / D2 ≤ 0.3, the gap between the collector component 40 and the electrode terminal 30 is reduced and the connection strength between the collector component 40 and the electrode terminal 30 is improved.

[0195] In some embodiments, t1×D1 / D2 ≥ 0.05.

[0196] The smaller the value of t1, the smaller the current-carrying area of ​​the collector component 40 and the lower the current-carrying capacity of the collector component 40. Similarly, the smaller the value of D1 / D2, the smaller the contact area between the collector component 40 and the electrode terminal 30 and the smaller the current-carrying area between the collector component 40 and the electrode terminal 30.

[0197] The inventor found that an excessively small value for t1×D1 / D2 can lead to an insufficient current flow area between the collector component 40 and the electrode terminal 30. This results in excessive heat generation within the collector component 40, thereby impairing the reliability and safety of the battery cell 7.

[0198] After extensive research and numerous experiments, the inventor found that if t1×D1 / D2 ≥ 0.05, the current flow capability between the collector component 40 and the electrode terminal 30 can be improved, heat generation reduced, and the reliability and safety of the battery cell 7 improved.

[0199] In some embodiments, the value of t1×D1 / D2 can be 0.05, 0.1, 0.2, 0.3 or 0.4.

[0200] In some embodiments, t1 is between 0.1 mm and 1 mm.

[0201] The larger the value of t1, the higher the strength of the collector component 40 and the lower the probability that the collector component 40 will deform under pressure. If a gap forms between the electrode clamp 30 and the collector component 40 due to unevenness, the collector component 40 will be difficult to deform when the electrode clamp 30 and the collector component 40 are pressed together if the value of t1 is too high due to its high strength. As a result, the collector component 40 cannot fit tightly against the electrode clamp 30, leading to a larger gap between the collector component 40 and the electrode clamp 30.

[0202] The smaller the value of t1, the smaller the current-carrying area of ​​the collector component 40 and the lower the current-carrying capacity of the collector component 40. If the value of t1 is too small, this can lead to excessive heat generation in the collector component 40 and impair the reliability and safety of the battery cell 7.

[0203] After extensive research and numerous experiments, the inventor found that limiting the value of t1 to 0.1 mm to 1 mm improves the current flow capability of the collector component 40, reduces the gap between the collector component 40 and the electrode clamp 30, and improves the connection strength between the collector component 40 and the electrode clamp 30.

[0204] Optionally, t1 can be 0.1 mm, 0.2 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.8 mm or 1 mm.

[0205] In some embodiments, t1 is between 0.2 mm and 0.6 mm.

[0206] After extensive research and numerous experiments, the inventor found that the current flow capability of the collector component 40 could be further improved, the gap between the collector component 40 and the electrode clamp 30 could be reduced, and the connection strength between the collector component 40 and the electrode clamp 30 could be improved by limiting the value of t1 to 0.2 mm to 0.6 mm.

[0207] In some embodiments, the electrode clamp 30 is welded to the collector component 40. For example, the collector component 40 and the electrode clamp 30 are joined by laser welding. The embodiment of the present application can reduce the gap between the collector component 40 and the electrode clamp 30 at the contact point and thereby reduce the risk of cold welds.

[0208] In some embodiments, the electrode clamp 30 is welded to the collector component 40 and forms the first weld section W1.

[0209] During welding, part of the electrode clamp 30 and part of the commutator component 40 melt and form a molten pool. After the molten pool has solidified, the first weld section W1 is formed.

[0210] Optionally, if the electrode arrangement 10 and the collector component 40 are installed in the housing body 20 and after the collector component 40 is in contact with the electrode clamp 30, the electrode clamp 30 and the collector component 40 can be welded together by an external welding device from one side of the electrode clamp 30 facing away from the collector component 40 in order to form a first weld section W1.

[0211] Alternatively, if the electrode assembly 10 and the collector component 40 are installed in the housing body 20 and after the collector component 40 is in contact with the electrode clamp 30, an external welding device can pass through the electrode assembly 10 and weld the electrode clamp 30 and the collector component 40 from one side of the collector component 40 facing away from the electrode clamp 30 to form a first weld section W1.

[0212] The embodiments of the present application do not impose any specific restrictions regarding the shape, position, depth, and number of the first weld section W1. For example, the shape of the first weld section W1 may be straight, rectangular, annular, spiral, V-shaped, or any other shape. The first weld section W1 may be one or more.

[0213] In some embodiments, the melting point of the electrode terminal 30 is T1, and the melting point of the collector component is T2, where T1 / T2 is 0.8 to 1.1.

[0214] T1 is the melting point of the electrode terminal 30 under normal pressure, and T2 is the melting point of the collector component 40 under normal pressure.

[0215] During welding, part of the electrode clamp 30 and part of the commutator component 40 melt and form a molten pool. After the molten pool has solidified, the first weld section W1 is formed.

[0216] The difference between the melting point of the electrode clamp 30 and the melting point of the collector component 40 affects the weld strength of the electrode clamp 30 and the collector component 40.

[0217] After extensive research and numerous experiments, the inventor determined that when T1 / T2 is less than 0.8, the melting point of the electrode clamp 30 is lower than the melting point of the commutator component 40. At low welding power, it can therefore be difficult to melt the commutator component 40 and form a miscible bond with the electrode clamp 30. At higher welding power, the electrode clamp 30 can melt and vaporize quickly, creating voids and hindering the formation of an effective weld.

[0218] After extensive research and numerous experiments, the inventor determined that when T1 / T2 is greater than 1.1, the melting point of the electrode clamp 30 is higher than the melting point of the commutator component 40. Therefore, at low welding power, it can be difficult to melt the electrode clamp 30. At higher welding power, fluctuating welding parameters can cause the weld pool depth to vary, and the commutator component 40 can be easily melted through due to its lower melting point.

[0219] The inventor limited T1 / T2 to 0.8 to 1.1 in order to reduce the difference between the melting point of the electrode clamp 30 and the melting point of the collector component 40, to improve the welding process and to increase weld strength.

[0220] For example, the value of T1 / T2 is 0.8, 0.9, 0.95, 1, 1.05 or 1.1. Optionally, the value of T1 / T2 is between 0.95 and 1.05.

[0221] In some embodiments, the electrode clamp 30 comprises a first recessed section 31 and a connecting section 32 located on the underside of the first recessed section 31. In some embodiments, the collector component 40 is welded to the connecting section 32, forming a first welded section W1.

[0222] The first recess section 31 can be recessed from the side of the electrode clamp 30 facing away from the electrode arrangement 10 in a direction facing the electrode arrangement 10, or it can be recessed from the side of the electrode clamp 30 facing the electrode arrangement 10 in a direction away from the electrode arrangement 10.

[0223] The first recess section 31 can be a cylindrical recess section, a conical recess section, a stepped recess section, or a recess section of other shapes.

[0224] For example, the connecting section 32 can be part of the electrode clamp 30, which corresponds to the base surface 311 of the first recess section.

[0225] In this embodiment of the present application, by forming a first recess section 31 on the electrode clamp 30 to reduce the thickness of the connection section 32, the welding power required to weld the connection section 32 to the collector component 40 is reduced, heat generation is reduced, the risk of burning through other components is reduced and safety is improved.

[0226] In some embodiments, the first weld section W1 extends at least to the interior of the collector component 40 in the thickness direction Z of the collector component 40 from the side of the connection section 32 facing away from the collector component 40.

[0227] The first weld section W1 can penetrate the collector component 40. For example, the first weld section W1 penetrates the collector component 40 and the connecting section 32, with the first weld section W1 being exposed on the surface of the collector component 40 facing away from the connecting section 32. Of course, the first weld section W1 cannot penetrate the collector component 40, i.e., the first weld section W1 is not exposed on the surface of the collector component 40 facing away from the connecting section 32.

[0228] The first welding section W1 extends from the connecting section 32 into the interior of the collector component 40 to connect the collector component 40 and the connecting section 32. This reduces the contact resistance between the collector component 40 and the electrode clamp 30 and improves the current flow capability.

[0229] In some embodiments, the first weld section W1 does not protrude from the surface of the collector component 40 facing away from the connection section 32 in the thickness direction Z of the connection section 32. The first weld section W1 is arranged at a predetermined distance from the surface of the collector component 40 facing away from the connection section 32 in order to prevent the collector component 40 from melting through, to reduce the risk of metal particles forming on the surface of the collector component 40 facing away from the connection section 32, and to improve safety.

[0230] In some embodiments, the housing body 20 comprises a cylinder 21 and a cover 22 connected to the cylinder 21, the cylinder 21 being arranged around an outer circumference of the electrode assembly 10, the cover 22 being provided with an electrode exit hole 221, and the electrode clamp 30 being installed in the electrode exit hole 221. The first weld section W1 and the cover 22 are both annular, with an outer diameter of the cover 22 being D6 and an inner diameter of the first weld section W1 being D7, where D6 and D7 satisfy the following: 0.1 ≤ D7 / D6 ≤ 0.6.

[0231] The first weld section W1 can be a closed or an open structure. In other words, the first weld section W1 can be a semicircular ring or a full circle. Optionally, the center angle of the first annular weld section W1 can be 180° to 360°.

[0232] D6 correlates positively with the diameter of the electrode arrangement 10. The larger D6 is, the higher the capacity of the electrode arrangement 10 and the higher the requirements for the current-carrying area of ​​the battery cell 7 in the first welding section W1. The smaller D7 is, the smaller the circumference of the first welding section W1 and the smaller the current-carrying area of ​​the first welding section W1. If the ratio D7 / D6 is too small, this leads to an insufficient current-carrying area of ​​the first welding section W1 due to an excessively large D6 and an excessively small D7. The first welding section W1 generates a lot of heat during charging and discharging, which means that the requirements for current-carrying capacity and temperature rise of the battery cell 7 during fast charging cannot be met.After extensive research and numerous experiments, the inventor determined that if D7 / D6 ≥ 0.1 is met, the requirements for battery cells 7 regarding current flow capacity and temperature rise can be fulfilled.

[0233] The larger D7 is, the larger the dimensions of the electrode exit hole 221 and the smaller the area of ​​the cover 22. The smaller D6 is, the smaller the area of ​​the cover 22. If D7 / D6 is too large, then D6 is too small and D7 too large, and the cover 22 tends to deform when the battery cell 7 vibrates, which poses a safety risk. The cover 22 can serve as an output end of the battery cell 7 for connection to the current collection component. If the D7 / D6 ratio is too large, the contact area between the cover 22 and the current collection component is too small, the current flow area between the cover 22 and the current collection component is insufficient, and the heat generation at the connection point between the cover 22 and the current collection component is too high, making it difficult to meet the requirements for current flow capacity and temperature rise of the battery cell 7 during fast charging.After extensive research and numerous experiments, the inventor determined that if D7 / D6 ≤ 0.6 is met, the requirements for battery cells 7 regarding current flow capacity and temperature rise can be met, thus increasing the safety of battery cell 7.

[0234] Optionally, D7 / D6 can be 0.1, 0.2, 0.3, 0.4, 0.5 or 0.6.

[0235] In some embodiments, after extensive research and numerous experiments, the inventor found that if 0.2 ≤ D7 / D6 ≤ 0.4 is met, the requirements for battery cells 7 regarding current flow capacity and temperature rise can be better met, which increases the safety of the battery cell 7.

[0236] In some embodiments, D7 is 5 mm to 14 mm.

[0237] If D7 is too small, this results in an insufficient current flow area of ​​the first weld section W1. The first weld section W1 generates a great deal of heat during charging and discharging, which prevents the requirements for current flow capacity and temperature rise of the battery cell 7 from being met during fast charging. If D7 is too large, the current flow area between the cover 22 and the current collection component is insufficient, and the heat generation at the connection point between the cover 22 and the current collection component is too high. After extensive research and numerous experiments, the inventor determined that limiting D7 to between 5 mm and 14 mm allows the requirements for battery cells 7 regarding current flow capacity and temperature rise to be met.

[0238] Optionally, D7 can be 5 mm, 7 mm, 9 mm, 10 mm, 12 mm or 14 mm.

[0239] In some embodiments, a dimension of the first weld section W1 h is defined in the thickness direction of the collector component 40, where the thickness of the connection section 32 is D8, where D8 and h satisfy the following: 1 <h / D8≤ 1,5.

[0240] The first weld section W1 is ring-shaped. Due to process defects, different areas of the first weld section W1 can exhibit different weld depths in the thickness direction Z. h can be the dimension along the thickness direction Z of the area where the first weld section W1 has the shallowest weld depth.

[0241] In some examples, the connecting section 32 is a flat plate construction with a uniform thickness, and any part of the connecting section 32 can be used for welding to the collector component 40. D8 is the thickness of the connecting section 32. In some other examples, the connecting section 32 has a non-uniform thickness. The area of ​​the connecting section 32 with the reduced thickness can be used for welding to the collector component 40. This reduces the welding requirements and heat generation. In this case, D8 can be the minimum thickness of the connecting section 32.

[0242] If h / D8 ≤ 1, the weld depth of the first weld section W1 is shallow, and the first weld section W1 forms as a single unit at the connecting section 32, resulting in a weld failure. The first weld section W1 cannot effectively join the collector component 40 and the connecting section 32. For a given value of D8, the power required for welding and the heat generated during the welding process increase with increasing h. If h is too large, the high temperature generated during welding can easily damage the component around the electrode clamps 30, thus creating safety hazards.

[0243] After extensive research and numerous experiments, the inventor discovered that if 1 <h / D8 ≤ 1,5 ist, die Festigkeit der Verbindungsstelle zwischen der Kollektorkomponente 40 und dem Verbindungsabschnitt 32 verbessert, die Wärmeentwicklung beim Schweißen reduziert und die Schweißschwierigkeit verringert werden kann.

[0244] Optionally, h / D8 can be 1.05, 1.1, 1.2, 1.3, 1.4 or 1.5.

[0245] In some embodiments, the thickness of a region of the collector component 40 for welding to the connecting section 32 D9, wherein D8 and D9 satisfy the following: 0.5 ≤ D9 / D8 ≤ 1.2.

[0246] The area of ​​the collector component 40, which is used for welding to the connecting section 32, refers to the area that corresponds to the surface that is in contact with the connecting section 32.

[0247] The smaller D9 is at a given value of D8, the more easily the collector component 40 melts through during the welding process and the more easily the high-temperature particles generated during welding fall into the battery cell 7; the larger D9 is, the greater the space requirement and weight of the collector component 40 and the lower the energy density of the battery cell 7.

[0248] After extensive research and numerous experiments, the inventor found that if 0.5≤D9 / D8≤1.2, the risk of melting through the collector component 40 can be reduced and the loss of energy density of the battery cell 7 can be reduced.

[0249] Optionally, D9 / D8 can be 0.5, 0.7, 0.9, 1.0 or 1.2.

[0250] In some embodiments, D8 is 0.4 mm to 1.2 mm.

[0251] The smaller the value of D8, the lower the current-carrying capacity of the connection section 32. If D8 is too small, the connection section 32 may not be able to meet the battery cell's requirements regarding current-carrying capacity and temperature rise during fast charging. As the value of D8 increases, the power required for welding and the heat generated during the welding process also increase. If D8 is too large, the high temperature generated during welding can easily damage the component around the electrode clamps 30, thus creating safety hazards.

[0252] After extensive research and numerous experiments, the inventor found that if D8 is limited to 0.4 mm to 1.2 mm, the requirements for battery cells 7 regarding current flow capacity and temperature rise can be met, and heat generation during welding is reduced and safety is improved.

[0253] Optionally, D8 can be 0.4 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1.0 mm or 1.2 mm.

[0254] Optionally, after extensive research and numerous experiments, the inventor stated that if D8 is limited to 0.6 mm to 1.0 mm, the requirements for battery cells 7 regarding current flow capacity and temperature rise can be better met, and heat generation during welding is reduced and safety is improved.

[0255] In some embodiments, D9 is 0.2 mm to 0.6 mm. Optionally, D9 is 0.3 mm to 0.5 mm.

[0256] In some embodiments, the collector component 40 is welded to the first electrode tab 11 and forms a second weld section W2.

[0257] During the assembly of the battery cell 7, the first electrode tab 11 of the electrode assembly 10 can first be welded to the collector component 40, and then the electrode assembly 10 and the collector component 40 can be inserted into the housing body 20. Specifically, when welding the first electrode tab 11 to the collector component 40, the collector component 40 can be pressed against the flattened end surface 111 of the first electrode tab 11, and then an external welding device emits a laser onto the surface of the collector component 40 facing away from the first electrode tab 11, and the laser welds the collector component 40 and the first electrode tab 11 together.

[0258] For example, the shape of the second weld section W2 can be straight, C-shaped, ring-shaped, spiral, V-shaped, or any other shape; this embodiment is not limited to such shapes. The second weld section W2 can be one or more sections.

[0259] The second welding section W2 can reduce the contact resistance between the collector component 40 and the first electrode tab 11, thereby improving the current flow capability.

[0260] In some embodiments, the first electrode tab 11 is arranged around a central axis A of the electrode arrangement 10, wherein the section of the first electrode tab 11, which runs perpendicular to the central axis A, is circular; an outer radius of the first electrode tab 11 is R, wherein a minimum distance between the second weld section W2 and the central axis A in the radial direction of the first electrode tab 11 D 10 is, where D 10and R must satisfy the following: 0.2 ≤ D 10 / R ≤ 0.8.

[0261] The cut of the first electrode tab 11 perpendicular to the central axis A does not have to be an absolute circle; a certain deviation is permissible.

[0262] R correlates positively with the diameter of the electrode arrangement 10. The larger R is, the higher the current generated by the electrode arrangement 10 and the higher the requirements for the current-carrying area of ​​the battery cell 7. The part of the collector component 40 near the central axis can be welded to the connecting section 32; the smaller D 10 The smaller the area of ​​the collector component 40 that can be welded to the connecting section 32, and the smaller the current flow area between the collector component 40 and the connecting section 32. Is D 10 / R too small, this leads to a D that is too small 10and an excessively large R leads to an insufficient current flow area between the collector component 40 and the connection section 32. The weld between the collector component 40 and the connection section 32 generates a lot of heat during charging and discharging, which means that the requirements for current flow capacity and temperature rise of the battery cell 7 during fast charging cannot be met.

[0263] The first electrode tab 11 comprises several electrode tab layers, each layer wound around the central axis A. In the radial direction of the first electrode tab 11, several electrode tab layers are stacked. The current on the electrode tab layer directly connected to the second welding section W2 can be conducted directly to the collector component 40 via the second welding section W2. The current on the electrode tab layer not connected to the second welding section W2 must first be conducted via the electrode tab layer directly connected to the second welding section W2 before it can reach the collector component 40 via the second welding section W2. This results in differences in the conduction paths between the individual collector components and the electrode clamps.If the difference is too large, this can easily lead to polarization problems.

[0264] Is D 10 If the electrode gap is too small, this leads to a larger distance between the second welding section W2 and the outermost electrode plate layer. This results in a greater difference between the current path between the outermost electrode plate layer and the electrode clamp 30 and the current path between the innermost electrode plate layer and the electrode clamp 30. This leads to an uneven current density of the first electrode foil of the electrode arrangement 10 and an increased internal resistance.

[0265] After extensive research and numerous experiments, the inventor discovered that if D 10 If / R ≥ 0.2 is met, the requirements for battery cells 7 regarding current flow capacity and temperature rise can be met.

[0266] The larger D 10The further out the electrode plate layer is located, which is directly connected to the second welding section W2. Is D 10 If the electrode gap is too large, this results in a smaller number of electrode plate layers connected to the second welding section W2 and a greater distance between the second welding section W2 and the innermost electrode plate layer. This leads to a greater difference between the current path between the outermost electrode plate layer and the electrode clamp 30 and the current path between the innermost electrode plate layer and the electrode clamp 30. This results in an uneven current density of the first electrode foil and an increased internal resistance.

[0267] After extensive research and numerous experiments, the inventor discovered that if D 10 / R ≤ 0.8, which reduces the difference in the current path between different positions of the first electrode tab 11 and the electrode clamp 30, improves the uniformity of the current density of the first electrode foil of the electrode arrangement 10, reduces the internal resistance and increases the current flow capability.

[0268] Optionally, D 10 / R 0.2, 0.3, 0.5, 0.7 or 0.8.

[0269] In some embodiments, after extensive research and numerous experiments, the inventor found that if 0.2 ≤ D 10 If / R ≤ 0.5 is met, the current flow capability of battery cell 7 can be improved, which increases the safety of battery cell 7.

[0270] In some embodiments, D is 10 3.5mm to 10mm.

[0271] Is D 10Too small, this leads to an insufficient current flow area between the collector component 40 and the connecting section 32. The weld between the collector component 40 and the connecting section 32 generates a lot of heat during charging and discharging, which prevents the requirements for current flow capacity and temperature rise of the battery cell 7 from being met during fast charging. After extensive research and numerous experiments, the inventor found that if D 10 If ≥ 3.5mm is met, the requirements for battery cells 7 regarding current flow capacity and temperature rise can be met.

[0272] Is D 10If the electrode plate is too large, this leads to a smaller number of electrode plate layers connected to the second weld section W2, and to an excessive distance between the electrode plate layer near the central axis A and the second weld section W2. This results in a higher internal resistance of the electrode arrangement 10 and impairs the performance of the battery cell 7. After extensive research and numerous experiments, the inventor found that if D 10 If the requirement of ≤ 10mm is met, the internal resistance of the electrode arrangement 10 can be reduced, which improves the charging and discharging performance of the battery cell 7.

[0273] Optionally, D 10 3.5 mm, 4 mm, 5 mm, 7 mm, 8.5 mm or 10 mm.

[0274] In some embodiments, R is between 20 mm and 22.8 mm.

[0275] In some embodiments, the second welding section W2 is annular. The annular second welding section W2 has a large current flow area, which improves the uniformity of the current density of the first electrode foil, reduces the internal resistance, and increases the current flow capacity.

[0276] In some embodiments, the diameter of the collector component is 40 D2, with a diameter of the first electrode tab being 11 D 11 is, where D2 is smaller than D 11 .

[0277] D2 denotes the diameter of the outer edge of the collector component 40, i.e., the outer diameter of the collector component 40. 11 denotes the diameter of the outer edge of the first electrode tab 11, i.e., the outer diameter of the first electrode tab 11. For example, D 11 = 2*R.

[0278] The collector component 40 has a smaller diameter, which saves space and weight of the collector component 40 and increases the energy density of the battery cell 7.

[0279] In some embodiments, D2 and D fulfill 11 The following: 0.75 ≤ D2 / D 11 ≤ 0.97.

[0280] If D2 at a certain value of D 11 If the distance between the outer part of the first electrode tab 11 and the collector component 40 is too large, the conductive path between the outer part of the first electrode tab 11 and the collector component 40 is too long. This leads to a high internal resistance of the electrode arrangement 10 and impairs the performance of the battery cell 7. After extensive research and numerous experiments, the inventor found that if D2 / D 11If ≥ 0.75 is met, the internal resistance of the electrode arrangement 10 can be reduced, which improves the charging and discharging performance of the battery cell 7.

[0281] If D2 at a certain value of D 11 If the housing is too small, the coaxiality of the collector component 40 and the electrode arrangement 10 fluctuates due to assembly errors. As a result, the collector component 40 protrudes beyond the outer circumferential surface of the electrode arrangement 10. This makes it difficult to insert the collector component 40 and the electrode arrangement 10 into the housing and thus impairs assembly efficiency and product yield. After extensive research and numerous experiments, the inventor found that if D2 / D 11 ≤ 0.97, thereby reducing the risk of the collector component 40 protruding beyond the outer circumferential surface of the electrode arrangement 10 due to defects, and improving assembly efficiency and product yield.

[0282] Optionally, D2 / D 11 The values ​​will be 0.75, 0.8, 0.85, 0.9, 0.95 or 0.97.

[0283] In some embodiments, D2 is 35 mm to 44 mm. After extensive research and numerous experiments, the inventor found that limiting D2 to 35 mm to 44 mm reduces the internal resistance of the electrode arrangement 10, improves the charging and discharging performance of the battery cell 7, and reduces the risk of the collector component 40 protruding beyond the outer circumferential surface of the electrode arrangement 10 due to a defect.

[0284] Optionally, D2 can be 35 mm, 38 mm, 40 mm, 41 mm, 43 mm or 44 mm.

[0285] In some embodiments, after extensive research and numerous experiments, the inventor found that if D2 is limited to 38 mm to 41 mm, the internal resistance of the electrode arrangement 10 can be reduced more effectively, which improves the charging and discharging performance of the battery cell 7.

[0286] In some embodiments, the connecting section 32 is provided with a first through-hole 321, which serves to connect the space on the side of the connecting section 32 facing away from the electrode arrangement 10 with the interior of the housing body 20.

[0287] The first through-hole 321 forms an opening in the base surface 311 of the first recess section.

[0288] During the forming process of the battery cell 7, the first through-hole 321 can be used in several forming processes. For example, the first through-hole 321 can be used in the liquid injection process, the forming process, or other processes.

[0289] In particular, the first through-hole 321 serves to inject electrolyte solution into the interior of the housing body 20. When liquid injection is required, the injection head of an injection device presses against the connecting section 32 and then injects the electrolyte solution through the first through-hole 321 into the housing body 20.

[0290] During the formation process of the battery cell 7, gas is generated inside the housing body 20. The first through-hole 321 can also be used to connect to an external vacuum device in order to extract the gas inside the housing body 20.

[0291] In some embodiments, the collector component 40 is provided with a second through-hole 41, the second through-hole 41 being opposite the first through-hole 321, so that the electrolyte solution can flow through the second through-hole 41 into the interior of the housing body 20.

[0292] In some embodiments, the electrode arrangement 10 is a wound structure and has a third through-hole 14 in the middle of the winding. The third through-hole 14 penetrates the electrode arrangement 10 and is arranged opposite the first through-hole 321 and the second through-hole 41, so that the electrolyte solution can flow through the third through-hole 14 into the interior of the electrode arrangement 10.

[0293] In some embodiments, the battery cell 7 further comprises a sealing plate 60, the sealing plate 60 is connected to the electrode clamp 30 and closes the opening of the first recess section 31.

[0294] The sealing plate 60 can be arranged as a whole on the outside of the first recess section 31 or partially contained within the first recess section 31, as long as the sealing plate 60 can close the opening of the first recess section 31.

[0295] The sealing plate 60 can protect the connection section 32 from the outside, reduce the ingress of contaminants from the outside into the first recess section 31, reduce the risk of damage to the connection section 32 by contaminants from the outside and improve the sealing performance of the battery cell 7.

[0296] Furthermore, the sealing plate 60 can also seal the first through-hole 321. After the formation of the battery cell 7, the sealing plate 60 can reduce the risk of electrolyte solution leaking through the first through-hole 321 and the first recess section 31, thereby improving the sealing performance.

[0297] In some embodiments, a stepped surface is provided on the side wall of the first recess section 31, in which at least a part of the sealing plate 60 is received, and the stepped surface serves to support the sealing plate 60.

[0298] Fig. Figure 10 shows a schematic local sectional view of the battery cell according to some other embodiments of the present application; Fig. Figure 11 shows a schematic cross-sectional view of the in Fig. 10 electrode clamps shown; Fig. Figure 12 shows a schematic cross-sectional view of the in Fig. 10 collector components shown; Fig. Figure 13 shows an enlarged schematic representation of Fig. 12 in field E.

[0299] As in Fig. 10, Fig. 11, Fig. 12 to Fig. As shown in Figure 13, in some embodiments a surface of the electrode clamp 30, which is closest to the electrode arrangement 10, lies against the collector component 40 in a thickness direction Z of the collector component 40.

[0300] When the electrode assembly 10 and the collector component 40 are inserted into the housing, the collector component 40 first contacts the surface of the electrode clamp 30 that is closest to the electrode assembly 10. This can shorten the insertion path of the collector component 40 into the housing and improve assembly efficiency.

[0301] In some embodiments, the surface of the electrode clamp 30, which is closest to the electrode arrangement 10, runs perpendicular to the plane in the thickness direction Z.

[0302] In some embodiments, the electrode clamp 30 comprises a limiting section 33 and a first projecting section 34, wherein the limiting section 33 is received in the housing body 20. The limiting section 33 overlaps at least partially with the housing body 20 in the thickness direction Z of the collector component 40, with an upper end surface 341 of the first projecting section being closer to the electrode arrangement 10 than the limiting section 33. The upper end surface 341 of the first projecting section abuts the collector component 40.

[0303] The upper end surface 341 of the first projection section is the surface of the electrode clamp 30 that is closest to the electrode arrangement 10 in the thickness direction Z. The upper end surface 341 of the first projection section comprises the contact surface of the electrode clamp 30.

[0304] The upper end surface 341 of the first projection section can be in contact with the collector component 40 as a whole, or only a part of it can be in contact with the collector component 40.

[0305] In the thickness direction Z, at least a part of the first projection section 34 extends onto a side of the boundary section 33 facing the electrode arrangement 10. In other words, in the thickness direction Z, the first projection section 34 can extend entirely onto the side of the boundary section 33 facing the electrode arrangement 10, or it can extend only partially onto the side of the boundary section 33 facing the electrode arrangement 10.

[0306] The limiting section 33 can be directly connected to the first projection section 34 or indirectly connected to the first projection section 34 via other parts of the electrode clamp 30.

[0307] The embodiments described in the present application do not restrict the structure of the collector component 40. The collector component 40 can be a flat plate structure or other structures.

[0308] In some embodiments, the limiting section 33 can be limited by the housing body 20 to reduce the risk of the electrode terminals 30 protruding from the housing body 20 and to improve the reliability of the battery cell 7. The upper end face 341 of the first projection section projects from the limiting section 33, thus forming a gap between the limiting section 33 and the collector component 40. This reduces the mating area between the collector component 40 and the electrode terminal 30, and further reduces the gap between the collector component 40 and the first projection section 34, thereby improving the connection strength between the collector component 40 and the electrode terminal 30.

[0309] In some embodiments, the limiting section 33 overlaps at least partially with the cover 22 in the thickness direction Z of the collector component 40.

[0310] In some embodiments, the electrode clamp 30 further comprises a column-shaped section 35 and an outer flange 36, wherein the column-shaped section 35 extends through the electrode exit hole 221 and the outer flange 36 is located on an outside of the cover 22 and projects from the outer circumferential surface of the column-shaped section 35.

[0311] The limiting section 33 and the outer flange 36 can clamp a portion of the cover 22 from both sides to secure the electrode clamp to the cover 22. The limiting section 33 and the outer flange 36 can clamp the cover 22 directly or indirectly via other components (such as the insulating sealing element 70).

[0312] In some embodiments, the boundary section 33 is a ring-shaped structure that surrounds the column-shaped section 35.

[0313] In some embodiments, the first projecting section 34 protrudes from the surface of the column-shaped section 35 facing the electrode arrangement 10. For example, the first recessed section 31 is formed on the column-shaped section 35.

[0314] In some embodiments, the surface of the boundary section 33 facing the electrode arrangement 10 is flush with the surface of the column-shaped section 35 facing the electrode arrangement 10.

[0315] In some embodiments, the first projection section 34 protrudes from the limiting section 33 in the thickness direction Z of the collector component 40 by a dimension t2 of 0.05 mm to 0.35 mm.

[0316] The smaller t2 is, the higher the risk that the collector component 40 and the boundary section 44 will be in contact with each other; if t2 is too small, the boundary section 33 can impair the contact of the upper end surface 314 of the first projection section with the collector component 40. The larger t2 is, the greater the space occupied by the electrode terminals 30 and the lower the space utilization within the battery cell 7.

[0317] After extensive research and numerous experiments, the inventor found that limiting the value of t2 to 0.05 mm to 0.35 mm reduces the risk of the limiting section 33 coming into contact with the collector component 40, reduces the gap between the collector component 40 and the upper end surface 314 of the first projection section, and reduces the space loss of the battery cell 7.

[0318] Optionally, t2 can be 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm or 0.35 mm.

[0319] In some embodiments, t2 is 0.15 mm to 0.25 mm. After extensive research and numerous experiments, the inventor found that limiting the value of t2 to 0.15 mm to 0.25 mm further reduces the risk of the limiting section 33 abutting the collector component 40, reduces the gap between the collector component 40 and the upper end face 314 of the first projection section, and reduces the space loss of the battery cell 7.

[0320] In some embodiments, a region of the electrode clamp 30, corresponding to the upper end surface 341 of the first projection section, is welded to the collector component 40 and forms a first weld section W1.

[0321] The upper end surface 341 of the first projection section can be circular, rectangular or otherwise shaped.

[0322] The area of ​​the electrode clamp 30 corresponding to the upper end face 341 of the first projection section refers to a solid portion of the electrode clamp 30 that corresponds to the upper end face 341 of the first projection section in the thickness direction Z. During welding, at least a portion of the area of ​​the electrode clamp 30 corresponding to the upper end face 341 of the first projection section melts.

[0323] The upper end surface 341 of the first projection section and the collector component 40 are in direct contact with each other, with a small gap between them. Welding the electrode clamp 30 and the area corresponding to the upper end surface 341 of the first projection section to the collector component 40 reduces the risk of a cold weld and increases the weld strength.

[0324] In some embodiments, the first weld section W1 is annular, with an outer diameter of the first weld section W1 being D3.

[0325] The first weld section W1 can be a closed or an open structure. In other words, the first weld section W1 can be a semicircular ring or a full circular ring.

[0326] In some embodiments, the upper end surface 341 of the first projection section is a circular surface. The upper end surface 341 of the first projection section can be a solid circular surface or a hollow circular surface (i.e., the upper end surface 341 of the first projection section can be an annular surface).

[0327] The diameter of the upper end surface 341 of the first projection section is D4. For example, the upper end surface 341 of the first projection section is a circular annular surface, and D4 denotes the outer diameter of the annular surface.

[0328] In some embodiments, D3 is smaller than D4.

[0329] During welding, defects can occur in the welding equipment, leading to variations in the welding position. If D3 is equal to D4, variations in the welding position can result in welding occurring outside the upper end surface 341 of the first projection section, which poses a risk of a cold weld. The embodiment of the present application ensures that D3 is smaller than D4 in order to compensate for welding defects, reduce the risk of cold welds, and improve weld strength.

[0330] In some embodiments, the electrode clamp 30 is provided on one side facing away from the first electrode tab 11 with a first recess section 31, wherein a part between a bottom surface 311 of the first recess section and the upper end surface 341 of the first projection section forms a connecting section 32, wherein the connecting section 32 is welded to the collector component 40 and forms the first welded section W1.

[0331] The embodiments of the present application do not restrict the size ratio between the bottom surface 311 of the first recess section and the upper end surface 341 of the first projection section.

[0332] For example, in the thickness direction Z, the bottom surface 311 of the first recess section and the upper end surface 341 of the first projection section overlap at least partially. The area formed by the overlap of the bottom surface 311 of the first recess section and the upper end surface 341 of the first projection section forms the connecting section 32.

[0333] In this embodiment of the present application, by forming a first recess section 31 on the electrode clamp 30 to reduce the thickness of the connection section 32, the welding power required to weld the connection section 32 to the collector component 40 is reduced, heat generation is reduced, the risk of burning through other components is reduced and safety is improved.

[0334] In some embodiments, the projection of the bottom surface 311 of the first recess section in the thickness direction Z is in the projection of the upper end surface 341 of the first projection section.

[0335] In some embodiments, the base surface 311 of the first recess section is a circular surface. The base surface 311 of the first recess section is a circular surface. The base surface 311 of the first recess section can be a solid circular surface or a hollow circular surface (i.e., the base surface 311 of the first recess section can be an annular surface).

[0336] In some embodiments, the diameter of the base surface 311 of the first recess section is D5. For example, the base surface 311 of the first recess section is a circular annular surface, and D5 denotes the outer diameter of the annular surface. Optionally, the base surface 311 of the first recess section can be a plane.

[0337] In some embodiments, D5 is smaller than D4.

[0338] The formation of a first recess section 31 reduces the thickness of the area where the electrode clamp 30 faces the bottom surface 311 of the first recess section, while the first projection section 34 increases the thickness of the area where the electrode clamp 30 faces the upper end surface 341 of the first projection section. With a constant thickness of the connection section 32, and if D5 is greater than or equal to D4, process defects may occur, resulting in a portion of the bottom surface 311 of the first recess section not being aligned with the upper end surface 341 of the first projection section. This leads to the local thickness of the electrode clamp 30 being less than the thickness of the connection section 32, which in turn reduces the local strength of the electrode clamp 30 and can lead to its failure if the battery cell 7 is subjected to an external shock.

[0339] The embodiment of the present application ensures that D5 is smaller than D4 in order to reduce the influence of the first recess section on the strength of the electrode clamp 30, to reduce the risk of electrode clamp 30 breaking and to improve the reliability of the battery cell 7.

[0340] In some embodiments, in the thickness direction Z of the collector component 40, the first projection section 34 as a whole is closer to the electrode arrangement 10 than the limiting section 33.

[0341] In some embodiments, the collector component 40 is welded to the first electrode tab 11, forming a second weld section W2. The second weld section W2 does not overlap with the upper end surface 341 of the first projection section in the thickness direction Z of the collector component 40.

[0342] The surface of the second weld section W2 is uneven. If the upper end surface 341 of the first projection section presses against the second weld section W2, the gap between the upper end surface 341 of the first projection section and the collector component 40 can increase, which impairs the welding effect between the collector component 40 and the electrode clamp 30.

[0343] In the embodiment of the present application, the second weld section W2 and the upper end surface 341 of the first projection section do not overlap in the thickness direction. This reduces the risk of the upper end surface 341 of the first projection section abutting the second weld section W2, reduces the gap between the upper end surface 341 of the first projection section and the collector component 40, and improves the weld strength.

[0344] In some embodiments, at least part of the second welding section W2 is located on the side of the electrode clamp 30 facing the first electrode tab 11 and is spaced apart from the electrode clamp 30.

[0345] The first protruding section 34 can abut the collector component 40 to form a gap between the electrode clamp 30 and the collector component 40, thereby avoiding the second welding section W2.

[0346] In the embodiment of the present application, the second weld section W2 is spaced apart from the electrode clamp 30, thereby reducing the risk that the second weld section W2 will impair the contact of the electrode clamp 30 with the collector component 40 and preventing overpositioning. The second weld section W2 can extend to the region of the first electrode tab 11, which is opposite the electrode clamp 30 in the thickness direction Z, so that the second weld section W2 can be connected to several electrode tab layers, thereby improving the current flow capability and reducing the polarization of the electrode foil.

[0347] In some embodiments, the diameter of the collector component is 40 D2, wherein the diameter of the upper end face 341 of the first projection section is D4, where D4 / D2≤ 0.4.

[0348] The larger the ratio D4 / D2, the larger the contact area between the collector component 40 and the upper end surface 341 of the first projection section must be. If the collector component 40 has irregularities, the maximum gap between the upper end surface 341 of the first projection section and the collector component 40 is also larger. The larger the value of D4 / D2, the more difficult it is to reduce the gap by pressing the electrode clamps 30 and the collector component 40 together.

[0349] By reducing the value of D4 / D2, the contact area between the collector component 40 and the upper end surface 341 of the first projection section can be reduced, the gap between the electrode clamp 30 and the collector component 40 can be reduced, and the difficulty of pressing together the collector component 40 and the first projection section 34 can be reduced.

[0350] After extensive research and numerous experiments, the inventor found that the gap between the collector component 40 and the first projection section 34 is reduced and the connection strength between the collector component 40 and the first projection section 34 is improved by ensuring that D4 / D2≤ 0.4.

[0351] In some embodiments, the collector component 40 is a flat plate structure. For example, the embodiments of the present application can also include the one described in Fig. Use the 6 collector components shown.

[0352] In some embodiments, the collector component 40 comprises a collector main body 42 and a second projecting section 43, wherein the collector main body 42 is connected to the first electrode tab 11, and wherein the second projecting section 43 extends from the surface of the collector main body 42 facing the electrode clamp 30, with the upper end face 431 of the second projecting section bearing against the electrode clamp 30. The collector main body 42 and the electrode clamp 30 are spaced apart from each other.

[0353] The embodiments of the present application do not restrict the structure of the electrode clamp 30. For example, the electrode clamp 30 can be configured as described in Fig. The electrode clamp shown in section 6 can be used, meaning that the electrode clamp cannot be provided with a first projection section. Alternatively, the electrode clamp shown in Fig. The electrode clamp shown in Figure 10 can be provided with a first projection section.

[0354] At least a part of the upper end surface 431 of the second projection section is in contact with the electrode clamp 30.

[0355] In the embodiment of the present application, a second projecting section 43 is provided on the collector component 40, thus forming a gap between the main collector body 42 and the electrode clamp 30. This reduces the mating surface between the collector component 40 and the electrode clamp 30, and the gap between the second projecting section 43 and the collector component 40 is thereby reduced, thus improving the connection strength between the collector component 40 and the electrode clamp 30.

[0356] In some embodiments, the second projection section 43 can be a solid or a hollow projection section.

[0357] In some embodiments, the second projection section 43 protrudes from the main collector body 42 in the thickness direction Z of the collector component 40 by a dimension t3 of 0.05 mm to 0.25 mm.

[0358] The smaller t3 is, the higher the risk that the collector main body 42 and the electrode terminal 30 will be in contact with each other; if t3 is too small, the collector main body 42 can impair the contact of the upper end surface 431 of the second projection section with the electrode terminal 30. The larger t3 is, the greater the space occupied by the collector component 40 and the lower the space utilization within the battery cell 7.

[0359] After extensive research and numerous experiments, the inventor found that limiting the value of t3 to 0.05 mm to 0.25 mm reduces the risk of the collector main body 42 contacting the electrode clamp 30, reduces the gap between the electrode clamp 30 and the upper end surface 431 of the second projection section, and reduces the space loss of the battery cell 7.

[0360] Optionally, t3 can be 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, or 0.25 mm.

[0361] In some embodiments, t3 is 0.1 mm to 0.2 mm. After extensive research and numerous experiments, the inventor found that limiting the value of t3 to 0.1 mm to 0.2 mm further reduces the risk of the collector main body 42 contacting the electrode terminal 30, reduces the gap between the electrode terminal 30 and the upper end face 431 of the second projection section, and reduces the space loss of the battery cell 7.

[0362] In some embodiments, a region of the collector main body 42, which surrounds the outside of the second projection section 43, is welded to the first electrode tab 11.

[0363] During welding, the second projecting section 43 does not cover any area of ​​the collector main body 42 that surrounds the outside of the second projecting section 43. This reduces the difficulty of welding and minimizes welding performance.

[0364] In some embodiments, the upper end surface 431 of the second projection section is a circular surface. The upper end surface 431 of the second projection section can be a solid circular surface or a hollow circular surface (i.e., the upper end surface 431 of the second projection section can be an annular surface).

[0365] The diameter of the upper end surface 431 of the second projection section is L. For example, the upper end surface 431 of the second projection section is a circular annular surface, and L denotes the outer diameter of the annular surface.

[0366] In some embodiments, the diameter of the collector component is 40 D2, wherein the diameter of the first projection section is 431 L, where L / D2 ≤ 0.4.

[0367] The larger the value of L / D2, the larger the contact area between the electrode clamp 30 and the upper end surface 431 of the second projection section must be. If the collector component 40 has irregularities, the maximum gap between the upper end surface 431 of the second projection section and the electrode clamp 30 is also larger. The larger the value of L / D2, the more difficult it is to reduce the gap by pressing the electrode clamps 30 and the collector component 40 together.

[0368] By reducing the value of L / D2, the contact area between the electrode clamp 30 and the upper end surface 431 of the second projection section can be reduced, the gap between the electrode clamp 30 and the collector component 40 can be reduced, and the difficulty of pressing together the electrode clamp 30 and the second projection section 43 can be reduced.

[0369] After extensive research and numerous experiments, the inventor found that the gap between the electrode clamp 30 and the second projection section 43 is reduced and the connection strength between the electrode clamp 30 and the second projection section 43 is improved by ensuring that L / D2 ≤ 0.4.

[0370] In some embodiments, the electrode clamp 30 comprises a first projection section 34, wherein the upper end surface 341 of the first projection section abuts the upper end surface 431 of the second projection section.

[0371] The embodiments of the present application do not limit the size of the upper end surface 341 of the first projection section and the upper end surface 431 of the second projection section. In some examples, the projection of the upper end surface 341 of the first projection section lies within the projection of the upper end surface 431 of the second projection section in the thickness direction Z; in some other examples, the projection of the upper end surface 431 of the second projection section lies within the projection of the upper end surface 341 of the first projection section in the thickness direction Z; and in still other examples, the projection of the upper end surface 431 of the second projection section partially overlaps with the projection of the upper end surface 341 of the first projection section in the thickness direction Z.

[0372] In the embodiment of the present application, a first projection section 34 and a second projection section 43 are provided, which further reduces the mating surface between the collector component 40 and the electrode clamp 30, and the gap between the first projection section 34 and the second projection section 43 is thereby reduced, thus improving the connection strength between the collector component 40 and the electrode clamp 30.

[0373] In some embodiments, the collector component 40 further comprises a third projection section 44, wherein the third projection section 44 protrudes from a surface of the collector main body 42 facing the first electrode tab 11.

[0374] When assembling the electrode arrangement 10 and the collector component 40, the third projection section 44 can be inserted into the first electrode tab 11 by pressing the first electrode tab 11 into the first electrode tab 11, thereby improving the stability of the contact between the first electrode tab 11 and the collector component 40.

[0375] In some embodiments, the second projection section 43 and the third projection section 44 overlap at least partially in the thickness direction Z.

[0376] In some embodiments, the third projection section 44 and the second projection section 43 are arranged symmetrically around the collector main body 42. For example, the collector main body 42 is a flat plate structure with a uniform thickness.

[0377] The embodiments of the present application can avoid errors, since the need to determine the orientation of the collector component 40 during the assembly of the electrode arrangement 10 and the collector component 40 is eliminated, thereby improving assembly efficiency.

[0378] Fig. Figure 14 shows a schematic local sectional view of the battery cell according to some other embodiments of the present application; Fig. Figure 15 shows a schematic cross-sectional view of the in Fig. 14 electrode clamp shown; Fig. Figure 16 shows a schematic cross-sectional view of the in Fig. 14 collector component shown.

[0379] As in Fig. 14, Fig. 15 to Fig. As shown in Figure 16, in some embodiments the electrode clamp 30 is provided with a second recess section 37 on a side facing the collector component 40. At least a part of the second projection section 43 is received in the second recess section 37, and an upper end surface 431 of the second projection section rests against a bottom surface 371 of the second recess section.

[0380] The floor area 371 of the second recess section includes the contact surface of the electrode clamp 30.

[0381] The second recess section 37 can position the second recess section 43, thereby simplifying the assembly process of the electrode clamp 30 and the collector component 40 and improving assembly efficiency.

[0382] In some embodiments, the electrode clamp 30 is provided with a first recess section 31 on a side facing away from the collector component 40. The section between the bottom surface 311 of the first recess section and the bottom surface 371 of the second recess section forms a connecting section 32. The connecting section 32 is welded to the second projecting section 43 and forms the first welded section W1. For example, the first recess section 31 has a stepped surface.

[0383] In this embodiment, the thickness of the connecting section 32 is reduced by simultaneously arranging the first recess section 31 and the second recess section 37. This reduces the required depth of the first recess section 31 and simplifies the forming process. The arrangement of the second recess section 37 allows the interior space of the battery cell 7 to be enlarged, thus improving the energy density.

[0384] In some embodiments, the collector component 40 is provided with a third recess section 45 at a position corresponding to the second projection section 43, wherein the third recess section 45 is recessed relative to the surface of the collector main body 42 facing the first electrode tab 11.

[0385] The third recess section 45 can reduce the space requirement of the collector component 40 and reduce the weight of the collector component 40. For example, the second projection section 43 and the third recess section 45 are formed by punching the collector component 40.

[0386] Fig. Figure 17 shows a schematic local sectional view of the battery cell according to some other embodiments of the present application; Fig. Figure 18 shows an enlarged schematic representation of Fig. 17 in field F.

[0387] As in Fig. 17 and Fig. As shown in Figure 18, in some embodiments the electrode clamp 30 is provided with an annular recess section 38 on one side facing the electrode arrangement 10, wherein the annular recess section 38 is arranged around the first projection section 34. The annular recess section 38 is recessed relative to the surface of the boundary section 33 facing the electrode arrangement 10 and separates at least a part of the boundary section 33 from the first projection section 34.

[0388] For example, the limiting section 33 is formed around the first projecting section 34, and the limiting section 33 has a shape that is bent towards the inner surface of the cover 22 in order to be riveted to the inner surface of the cover 22.

[0389] For example, the boundary section 33 is a ring-shaped structure that surrounds the first projection section 34.

[0390] The boundary section 33 and the first projection section 34 define the annular recess section 38. The first projection section 34 protrudes from the lower end of the annular recess section 38.

[0391] The annular recess section 38 can separate at least part of the limiting section 33 from the first projection section 34 in order to reduce the force transmitted to the limiting section 33 when pressing the first projection section 34 and to minimize the risk of deformation of the limiting section 33.

[0392] In some embodiments, after the electrode clamp 30 has been inserted into the electrode exit hole 221, it can be pushed out from the inside of the housing body 20, so that the material of the electrode clamp 30 flows outwards and forms an outwardly bent and folded boundary section 33. At the pressed position, the electrode clamp 30 forms an annular recess section 38.

[0393] Fig. Figure 19 shows a schematic sectional view of the battery cell according to some other embodiments of the present application.

[0394] As in Fig. Figure 19 shows that in some embodiments the battery cell 7 is a square battery cell.

[0395] In some embodiments, the housing body 20 comprises a cylinder 21 and a cover, which are formed in one piece, with the cylinder 21 arranged around an outer circumference of the electrode arrangement 10. For example, the cylinder 21 can be a square cylinder.

[0396] The cylinder 21 has an opening at one end facing away from the cover 22, with the cover plate 50 covering the opening of the cylinder 21 to close it. For example, the cover plate 50 is welded to the cylinder 21.

[0397] In some embodiments, the battery cell 7 further comprises a first electrode terminal 30b and a second electrode terminal 30c with opposite polarity. The first electrode terminal 30b is electrically connected to a first electrode tab of the electrode arrangement 10, and the second electrode terminal 30c is electrically connected to a second electrode tab of the electrode arrangement 10.

[0398] In some embodiments, both the first electrode clamp 30b and the second electrode clamp 30c are installed on the cover 22.

[0399] The battery contains the current collection component with the electrode terminals of the multiple battery cells 7, so that the multiple battery cells 7 are connected in series, parallel, or a mixed configuration. Both the first electrode terminal 30b and the second electrode terminal 30c can be used for connection to the current collection component.

[0400] When the battery is subjected to an external shock, the current collection component pulls the cover 22 over the first electrode terminal 30b and the second electrode terminal 30c, thereby subjecting the connection between the cover 22 and the cylinder 21 to a force. If the cover 22 and the cylinder 21 are separate components, for example, if the cover 22 and the cylinder 21 are joined by welding, the connection between the cover 22 and the cylinder 21 may fail under stress. In the embodiment of the present application, the cover 22 and the cylinder 21 are formed as a single piece, thereby improving the strength of the connection between the cover 22 and the cylinder 21 and reducing the risk of connection failure between the cover 22 and the cylinder 21.

[0401] In some embodiments, the housing body 20 is neither electrically connected to the cathode of the electrode arrangement 10, nor is it electrically connected to the anode of the electrode arrangement 10. In other words, the housing body 20 is not charged.

[0402] In some embodiments, the first electrode tab and the second electrode tab of the electrode arrangement 10 are located on the same side of the electrode arrangement 10, which faces the cover 22.

[0403] In some embodiments, the first electrode clamp 30b of the Fig. 6 Electrode clamp shown, which is in Fig. 10 Electrode clamp shown, which is in Fig. 14 Electrode clamp shown or another type of electrode clamp.

[0404] In some embodiments, the first electrode terminal 30b is connected to the first electrode tab via the collector component 40. The collector component 40 of the square battery cell can also be the Fig. 6 collector component shown, which is in Fig. 10 collector component shown, which is in Fig. 14. Collector component shown or a collector component of a different type.

[0405] The embodiments of the present application provide a battery comprising a battery cell according to one of the above embodiments.

[0406] Some embodiments of the present application provide a further power-consuming device comprising a battery according to one of the above embodiments, wherein the battery device is used to provide electrical energy. The power-consuming device may be one of the aforementioned devices or systems that use individual battery cells.

[0407] As in Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 to Fig. Figure 9 shows an embodiment of the present application providing a cylindrical battery cell 7 comprising an electrode arrangement 10, a housing body 20, an electrode clamp 30, a collector component 40 and a cover plate 50.

[0408] The housing body 20 comprises a cylinder 21 and a cover 22, which are formed in one piece, wherein the cylinder 21 is arranged around an outer circumference of the electrode assembly 10, and wherein the cover 22 is provided with an electrode outlet hole 221, the electrode clamp 30 being installed in the electrode outlet hole 221. The cylinder 21 has an opening at an end facing away from the cover 22, and the cover plate 50 covers the opening of the cylinder 21 to close it.

[0409] The electrode assembly 10 comprises a main body section 12, a first electrode tab 111, and a second electrode tab 112, wherein the first electrode tab 11 and the second electrode tab 13 project from the main body section 12. The first electrode tab 11 is located at one end of the electrode assembly 10 facing the electrode clamp 30, and the second electrode tab 13 is located at one end of the electrode assembly 10 facing away from the electrode clamp 30.

[0410] The electrode clamp 30 has a contact surface 30a that rests against the collector component 40. The contact surface 30a is a circular plane. The diameter of the contact surface 30a is D1. A diameter of the collector component 40 is D2, and a minimum thickness of the collector component 40 is t1, where D1, D2, and t1 satisfy the following: t1 × D1 / D2 ≤ 0.4.

[0411] The electrode clamp 30 comprises a first recessed section 31 and a connecting section 32 located on the underside of the first recessed section 31. In some embodiments, the collector component 40 is welded to the connecting section 32, forming a first welded section W1.

[0412] It should be noted that the embodiments of the present application and the features in the embodiments can be combined without conflict.

[0413] Finally, it should be noted that the foregoing embodiments serve only to illustrate the technical solution of the present application and do not constitute a limitation. Although the present application has been described in detail with reference to the foregoing embodiments, the person skilled in the art will recognize that modifications to the technical solutions described in the foregoing embodiments or equivalent substitutions of individual technical features are possible without departing from the essential concept and scope of protection of the technical solutions of the embodiments of the present application.

Claims

[1] Battery cell comprising the following: a housing body; an electrode clamp that is provided in the housing body; an electrode arrangement which is received in the housing body, wherein a first electrode tab is provided at one end of the electrode arrangement facing the electrode clamp; a collector component connected to the first electrode tab, wherein at least a part of the collector component is located on one side of the electrode clamp facing the first electrode tab and is in contact with and connected to the electrode clamp. [2] Battery cell according to claim 1, characterized by , that the collector component rests against and is connected to one of the end surfaces of the first electrode tab facing the electrode clamp. [3] Battery cell according to claim 1 or 2, wherein the electrode terminals have a contact surface which rests against the collector component, wherein a diameter of the contact surface is D1; where D2 is a diameter of the collector component, and t1 is a minimum thickness of the collector component; where D1, D2 and t satisfy the following: t1×D1 / D2 ≤0.

4. [4] Battery cell according to claim 3, wherein D1, D2 and t1 satisfy the following: 0.05 ≤ t1×D1 / D2 ≤ 0.

3. [5] Battery cell according to claim 3 or 4, wherein t1 is 0.1 mm to 1 mm, wherein t1 is optionally 0.2 mm to 0.6 mm. [6] Battery cell according to one of claims 1 to 5, wherein a surface of the electrode clamp that is closest to the electrode arrangement is in contact with the collector component in a thickness direction of the collector component. [7] Battery cell according to claim 6, wherein the electrode clamp comprises a limiting section and a first projection section, wherein the limiting section is received in the housing body; wherein the limiting section overlaps at least partially with the housing body in the thickness direction of the collector component, wherein an upper end surface of the first projection section is closer to the electrode arrangement than the limiting section; wherein the upper end surface of the first projection section abuts the collector component. [8] Battery cell according to claim 7, wherein in the thickness direction of the collector component the first projection section extends from the boundary section by a dimension t2 of 0.05 mm to 0.35 mm; wherein t2 is optionally 0.15 mm to 0.25 mm. [9] Battery cell according to claim 7 or 8, wherein a region of the electrode clamp corresponding to the upper end face of the first projection section is welded to the collector component and forms a first weld section. [10] Battery cell according to claim 9, wherein the first weld section is annular, wherein an outer diameter of the first weld section is D3, wherein a diameter of the upper end surface of the first projection section is D4, wherein D3 is smaller than D4. [11] Battery cell according to claim 9 or 10, wherein the electrode clamp is provided with a first recess section on a side facing away from the first electrode tab, wherein a part between a bottom surface of the first recess section and the upper end surface of the first projection section forms a connecting section, wherein the connecting section is welded to the collector component and forms the first welded section. [12] Battery cell according to claim 11, wherein a diameter of the bottom surface of the first projection section is D5, wherein a diameter of the upper end surface of the first projection section is D4, wherein D5 is smaller than D4. [13] Battery cell according to one of claims 7 to 12, wherein in the thickness direction of the collector component the first projection section as a whole is closer to the electrode arrangement than the limiting section. [14] Battery cell according to one of claims 7 to 12, wherein the electrode clamp is provided with an annular recess section on a side facing the electrode arrangement, wherein the annular recess section is arranged around the first projection section; wherein the annular recess section is recessed relative to the surface of the boundary section facing the electrode arrangement and separates at least a part of the boundary section from the first projection section. [15] Battery cell according to any one of claims 7 to 14, wherein the collector component is welded to the first electrode tab and forms a second weld section; wherein the second weld section does not overlap with the upper end surface of the first projection section in the thickness direction of the collector component. [16] Battery cell according to claim 15, wherein at least a part of the second welding section is located on the side of the electrode clamp facing the first electrode tab and is spaced apart from the electrode clamp. [17] Battery cell according to any one of claims 7 to 16, wherein the diameter of the collector component is D2, wherein the diameter of the upper end face of the first projection section is D4, wherein D4 / D2≤ 0.

4. [18] Battery cell according to one of claims 1 to 17, wherein the collector component comprises a collector main body and a second projection section, wherein the collector main body is connected to the first electrode tab, wherein the second projection section extends from the surface of the collector main body facing the electrode clamp, wherein the upper end surface of the second projection section rests against the electrode clamp, wherein the collector main body and the electrode clamp are spaced apart from each other. [19] Battery cell according to claim 18, wherein in the thickness direction of the collector component the second projection section extends from the main collector body by a dimension t3 of 0.05 mm to 0.25 mm; wherein t3 is optionally 0.1 mm to 0.2 mm. [20] Battery cell according to claim 18 or 19, wherein a region of the collector main body surrounding the outside of the second projection section is welded to the first electrode tab. [21] Battery cell according to one of claims 18 to 20, wherein the diameter of the collector component is D2, wherein the diameter of the first projection section is L, wherein L / D2 ≤ 0.

4. [22] Battery cell according to one of claims 18 to 21, wherein the electrode clamp comprises a first projection section, wherein the upper end surface of the first projection section abuts the upper end surface of the second projection section. [23] Battery cell according to one of claims 18 to 21, wherein the electrode clamp is provided with a second recess section on a side facing the collector component; wherein at least a part of the second projection section is received in the second recess section, and wherein an upper end surface of the second projection section rests against a bottom surface of the second recess section. [24] Battery cell according to one of claims 18 to 23, wherein the collector component further comprises a third projection section, the third projection section extending from a surface of the collector main body facing the first electrode tab. [25] Battery cell according to claim 24, wherein the third projection section and the second projection section are arranged symmetrically around the collector main body. [26] Battery cell according to one of claims 18 to 23, wherein the collector component is provided with a third recess section at a position corresponding to the second projection section, wherein the third recess section is recessed relative to the surface of the collector main body facing the first electrode tab. [27] Battery cell according to any one of claims 1 to 26, wherein the electrode clamp is welded to the collector component; wherein a melting point of the electrode clamp is T1, wherein a melting point of the collector component is T2, wherein T1 / T2 is 0.8 to 1.

1. [28] Battery cell according to any one of claims 1 to 27, wherein the electrode clamp comprises a first recess section and a connecting section located on a bottom side of the first recess section; wherein the collector component is welded to the connecting section and forms a first weld section; wherein the first weld section extends at least to the interior of the collector component in the thickness direction of the collector component from the side of the connecting section facing away from the collector component. [29] Battery cell according to claim 28, wherein the housing body comprises a cylinder and a cover connected to the cylinder, wherein the cylinder is arranged around an outer circumference of the electrode arrangement, wherein the cover is provided with an electrode exit hole, wherein the electrode clamp is installed in the electrode exit hole; wherein the first weld section and the lid are both annular, wherein an outer diameter of the lid is D6, and an inner diameter of the first weld section is D7; where D6 and D7 satisfy the following: 0.1 ≤ D7 / D6 ≤ 0.

6. [30] Battery cell according to claim 29, wherein 0.2 ≤ D7 / D6 ≤ 0.

4. [31] Battery cell according to claim 29 or 30, wherein D7 is 5 mm to 14 mm. [32] Battery cell according to one of claims 29-31, wherein the lid and the cylinder form a one-piece molded structure. [33] Battery cell according to any one of claims 28 to 32, wherein h is a dimension of the first weld section in the thickness direction of the collector component, wherein the thickness of the connection section is D8; wherein D8 and h satisfy the following: 1 <h / D8≤ 1,5. [34] Battery cell according to claim 33, wherein the thickness of a region of the collector component for welding with the connecting section D9 is, wherein D8 and D9 satisfy the following: 0.5 ≤ D9 / D8 ≤ 1.

2. [35] Battery cell according to claim 33 or 34, wherein D8 is 0.4 mm to 1.2 mm. [36] Battery cell according to any one of claims 1 to 35, wherein the collector component is welded to the first electrode tab and forms a second weld section; wherein the first electrode tab is arranged around a central axis of the electrode arrangement, wherein the section of the first electrode tab, which is perpendicular to the central axis, is circular; wherein an outer radius of the first electrode tab is R, wherein a minimum distance between the second weld section and the central axis in the radial direction of the first electrode tab is D 10 is, where D 10 and R must satisfy the following: 0.2 ≤ D 10 / R ≤ 0.

8. [37] Battery cell according to claim 36, wherein D 10 and R must satisfy the following: 0.2 ≤ D 10 / R ≤ 0.

5. [38] Battery cell according to claim 36 or 37, wherein D 10 3.5 mm to 10 mm. [39] Battery cell according to any one of claims 1 to 38, wherein the diameter of the collector component is D2, wherein the diameter of the first electrode tab is D 11 is, where D2 is smaller than D 11 . [40] Battery cell according to claim 39, wherein D2 and D 11 The following conditions must be met: 0.75 ≤ D2 / D 11 ≤ 0.

97. [41] Battery cell according to claim 39 or 40, wherein D2 is 35 mm to 44 mm. [42] Battery comprising a plurality of battery cells according to any one of claims 1 to 41. [43] Electrical power consumption device comprising a battery according to claim 42, wherein the battery is used to provide electrical energy.

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