Cover plate structure and battery cell

Abstract

The utility model relates to energy storage equipment technical field especially relates to a cover plate structure and electric core, cover plate structure includes top cap, compound pole, insulating sealing assembly, first welding piece and second welding piece. Among them, the first assembly hole is seted up on the top cap, and the compound pole part is inserted in the first assembly hole. The insulating sealing assembly is seted up with the second assembly hole, and the compound pole part is inserted in the second assembly hole. The first welding piece is located in the side of top cap towards the inside of electric core, and the compound pole is welded with the first welding piece, and the insulating sealing assembly part is clamped between the first welding piece and top cap. The second welding piece is located in the side of top cap towards the outside of electric core, and the compound pole is welded with the second welding piece. The electric core includes the casing and the cover plate structure above, and the cover plate structure cover sets up at the opening of casing. The cover plate structure and electric core can help to guarantee the fixed position of insulating sealing assembly, and can also reduce the processing cost of compound pole, improve the economy.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, and in particular to a cover plate structure and a battery cell. Background Technology

[0002] Using copper-aluminum composite terminals in the battery cell can improve the performance of the terminals. Copper-aluminum composite terminals combine the lightweight advantages of aluminum with the low resistance advantages of copper. A larger first base plate is required at the end of the terminal facing inwards from the battery cell. A sealing ring and part of the lower plastic clamp are sandwiched between the first base plate and the top cover plate. The first base plate serves to limit and fix the insulation and sealing components; a larger first base plate enhances this limiting effect. However, because the first base plate of the terminal is too large, the copper-aluminum composite terminal must be manufactured using machining methods, resulting in high costs and negatively impacting the economic viability of the battery cell. Utility Model Content

[0003] One objective of this invention is to provide a cover plate structure that helps to ensure the position of the insulating sealing component is fixed while reducing the processing cost of the composite pole and improving economic efficiency.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A cover plate structure is provided, comprising:

[0006] Top cover, wherein a first assembly hole is provided on the top cover;

[0007] A composite electrode post, wherein the composite electrode post portion is inserted into the first assembly hole;

[0008] An insulating and sealing assembly is provided with a second mounting hole, and the composite pole portion is inserted into the second mounting hole;

[0009] The first welded component is located on the side of the top cover facing the inside of the cell. The composite pole is welded to the first welded component. The insulating and sealing assembly is partially sandwiched between the first welded component and the top cover.

[0010] The second welded component is located on the side of the top cover facing the outside of the battery cell, and the composite pole is welded to the second welded component.

[0011] Optionally, the composite electrode has a first base plate, and a receiving groove is formed on the end face of the first welded part facing the inside of the cell. A third assembly hole is formed at the bottom of the receiving groove. The first base plate is located in the receiving groove, and the composite electrode passes through the third assembly hole.

[0012] Optionally, the first base plate is seam welded to the first welded component, and the weld penetration depth of the first base plate and the first welded component along the axial direction of the composite pole is a, and the thickness of the first welded component along the axial direction of the composite pole is e, satisfying: 0.3mm≤a≤0.9e.

[0013] Optionally, the end face of the first welded component facing the inside of the battery cell is flush with the end face of the first base plate facing the inside of the battery cell.

[0014] And / or, the first welded component is made of the same material as the first base plate.

[0015] Optionally, the second welded component has a fourth assembly hole, through which the first part of the composite pole passes and is welded to the second welded component.

[0016] Optionally, the first part has a first boss protruding outward from the cell and a first annular end face surrounding the first boss, the first annular end face being disposed outward from the cell, and the first annular end face being seam welded to the second weldment.

[0017] Optionally, along the radial direction of the composite pole, the width of the first annular end face is c, satisfying: 0.5mm≤c≤2mm;

[0018] And / or, along the axial direction of the composite pole, the height of the first boss is d, satisfying: 0.2mm≤d≤1.5mm;

[0019] And / or, along the axial direction of the composite pole, the weld penetration depth between the first annular end face and the second weldment is b, satisfying: 0.3mm≤b≤2mm;

[0020] And / or, the cross-section of the first boss is circular, and the diameter of the cross-section of the first boss is D, satisfying: 5mm≤D≤30mm;

[0021] And / or, the first part and the second welded part are made of the same material.

[0022] Optionally, the composite electrode post has a first protrusion protruding from the outside of the cell at one end, and the end face of the first protrusion facing the outside of the cell is welded to an external connector.

[0023] And / or, the composite pole has a first base plate at one end inside the cell, and the end face of the first base plate facing inside the cell is welded to the tab of the pole assembly or an internal connector.

[0024] Optionally, the composite pole includes a second part and a third part connected to each other, the second part being made of aluminum and the third part being made of copper, the volume of the second part being V1 and the volume of the third part being V2, satisfying: 0.1≤V2 / (V1+V2)≤0.5.

[0025] Another objective of this invention is to provide a battery cell that can help ensure the fixed position of the insulation and sealing components while reducing the processing cost of the composite pole and improving economic efficiency.

[0026] To achieve this objective, the present invention adopts the following technical solution:

[0027] A battery cell is provided, including a housing and the aforementioned cover structure, the cover structure covering an opening in the housing.

[0028] The beneficial effects of this utility model are:

[0029] This utility model provides a cover plate structure, including a top cover, a composite pole, an insulating sealing assembly, a first welded component, and a second welded component. The top cover has a first mounting hole, into which the composite pole is inserted. The insulating sealing assembly has a second mounting hole, into which the composite pole is inserted. The first welded component is located on the side of the top cover facing inwards from the battery cell. The composite pole is welded to the first welded component, and the insulating sealing assembly is sandwiched between the first welded component and the top cover. This improves the limiting and fixing effect of the insulating sealing assembly without increasing the size of the first base plate of the composite pole, allowing for the use of a lower-cost processing technology when manufacturing the composite pole. The second welded component is located on the side of the top cover facing outwards from the battery cell, and the composite pole is welded to the second welded component. By welding the first and second welded components at both ends of the composite pole, the cover plate structure is pressed tightly together, preventing the composite pole from shifting relative to the top cover, further ensuring the limiting and fixing effect of the insulating sealing assembly, guaranteeing the insulation and sealing characteristics of the cover plate structure, and improving the quality of the battery cell.

[0030] This utility model also provides a battery cell, including a housing and the aforementioned cover structure, the cover structure being disposed over the opening of the housing. This battery cell can help ensure the positional fixation of the insulating sealing assembly while also reducing the processing cost of the composite electrode post, thus improving economic efficiency. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the cover plate structure provided in this embodiment of the utility model;

[0032] Figure 2 This is a schematic diagram of the composite pole provided in an embodiment of the present invention;

[0033] Figure 3This is a cross-sectional view of the cover plate structure provided in this embodiment of the utility model;

[0034] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0035] Figure 5 yes Figure 3 Enlarged view of point B in the middle;

[0036] Figure 6 This is an exploded view of the cover plate structure provided in an embodiment of this utility model.

[0037] In the picture:

[0038] 1. Top cover; 101. First assembly hole;

[0039] 2. Composite pole; 21. First base plate; 22. First boss; 23. First annular end face; 201. Second part; 202. Third part;

[0040] 3. Second pole;

[0041] 4. First welded component; 41. Third assembly hole;

[0042] 5. Second welded component; 51. Fourth assembly hole;

[0043] 6. Third welded component; 7. First sealing ring; 8. Lower plastic; 9. First upper plastic; 10. Second upper plastic; 11. Second sealing ring. Detailed Implementation

[0044] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0045] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0046] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0047] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0048] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0049] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0050] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0051] Using copper-aluminum composite terminals in the battery cell can improve the performance of the terminals. Copper-aluminum composite terminals combine the lightweight advantages of aluminum with the low resistance advantages of copper. A larger first base plate is required at the end of the terminal facing inwards from the battery cell. A sealing ring and part of the lower plastic clamp are sandwiched between the first base plate and the top cover plate. The first base plate serves to limit and fix the insulation and sealing components; a larger first base plate enhances this limiting effect. However, because the first base plate of the terminal is too large, the copper-aluminum composite terminal must be manufactured using machining methods, resulting in high costs and negatively impacting the economic viability of the battery cell.

[0052] To address the aforementioned issues, this embodiment provides a cover plate structure that helps ensure the fixed position of the insulating sealing assembly while also reducing the processing cost of the composite pole and improving economic efficiency.

[0053] like Figures 1-6 As shown, the cover structure of this embodiment includes a top cover 1, a composite pole 2, an insulating sealing assembly, a first welded component 4, and a second welded component 5. The top cover 1 has a first mounting hole 101, and the composite pole 2 is partially inserted into the first mounting hole 101. The insulating sealing assembly has a second mounting hole, and the composite pole 2 is partially inserted into the second mounting hole. The first welded component 4 is located on the side of the top cover 1 facing the inside of the battery cell. The composite pole 2 is welded to the first welded component 4, and the insulating sealing assembly is partially sandwiched between the first welded component 4 and the top cover 1. This improves the limiting and fixing effect of the insulating sealing assembly without increasing the size of the first base plate 21 of the composite pole 2, allowing for the use of a lower-cost processing technology when manufacturing the composite pole 2. The second welded component 5 is located on the side of the top cover 1 facing the outside of the battery cell, and the composite pole 2 is welded to the second welded component 5.

[0054] By welding the first welding part 4 and the second welding part 5 at both ends of the composite pole 2, the cover plate structure can be pressed as a whole to prevent the composite pole 2 from moving relative to the top cover 1, further ensuring the limiting and fixing effect on the insulation and sealing components, ensuring the insulation and sealing characteristics of the cover plate structure, and improving the quality of the battery cell.

[0055] like Figure 2 As shown, optionally, the composite electrode 2 has a first base plate 21, which is located on the side of the top cover 1 facing the inside of the cell. A receiving groove is provided on the end face of the first welded part 4 facing the inside of the cell, and a third assembly hole 41 is provided at the bottom of the receiving groove. The first base plate 21 is located in the receiving groove, and the composite electrode 2 passes through the third assembly hole 41.

[0056] Optionally, the end face of the first welded part 4 facing the inside of the battery cell is flush with the end face of the first base plate 21 facing the inside of the battery cell to prevent protruding sharp objects and to maximize the use of this height space. In addition, since the first base plate 21 and the first welded part 4 are seam welded together, the flushness of the end face of the first welded part 4 facing the inside of the battery cell with the end face of the first base plate 21 facing the inside of the battery cell helps to ensure the welding quality.

[0057] Optionally, the first welded component 4 and the first base plate 21 are made of the same material, which can further improve the welding strength. In this embodiment, both the first base plate 21 and the first welded component 4 are made of copper.

[0058] Optionally, the first welded component 4 is a plate-shaped structure, and the plate surface of the plate-shaped structure and the plate surface of the first base plate 21 are parallel to the plate surface of the top cover 1, and all three are perpendicular to the axis of the composite pole 2.

[0059] Optionally, the end face of the first base plate 21 facing the inside of the cell is welded to the tabs of the electrode group or internal connectors. That is, the first welded part 4 is not welded to the tabs of the electrode group or internal connectors to avoid excessive internal resistance.

[0060] Optionally, the insulating sealing assembly includes a first upper plastic 9, which is partially sandwiched between the second welded part 5 and the top cover 1. The first upper plastic 9 has a side to wrap around the side wall of the second welded part 5, and the first upper plastic 9 also has a protruding ring protruding towards the inside of the cell. The protruding ring is inserted into the first mounting hole 101 to be sandwiched between the inner wall of the first mounting hole 101 and the composite pole 2, thereby ensuring insulation between the composite pole 2 and the top cover 1.

[0061] Optionally, the insulating sealing assembly also includes a lower plastic 8, which is attached to the side of the top cover 1 facing the inside of the cell, and the lower plastic 8 is partially sandwiched between the first welded part 4 and the top cover 1 to ensure insulation between the two.

[0062] Optionally, the insulating sealing assembly further includes a first sealing ring 7, which is sleeved on the composite electrode post 2. A portion of the first sealing ring 7 is located within the through-hole of the lower plastic 8. The protruding ring of the first upper plastic 9 abuts against the portion of the first sealing ring 7 that protrudes outward from the battery cell. This protruding portion of the first sealing ring 7 can seal the gap between the protruding ring and the composite electrode post 2, thereby improving the sealing performance of the cover structure. The end face of the first sealing ring 7 facing inward from the battery cell abuts against the first welded part 4. A portion of the first sealing ring 7 is sandwiched between the first welded part 4 and the top cover 1 to ensure sealing performance at this location.

[0063] Optionally, along the axial direction of the composite electrode post 2, the weld penetration depth between the first base plate 21 and the first welded component 4 is 'a', and along the axial direction of the composite electrode post 2, the thickness of the first welded component 4 is 'e', ​​satisfying: 0.3mm ≤ a ≤ 0.9e. If the weld penetration depth 'a' between the first base plate 21 and the first welded component 4 is less than 0.3mm, the weld strength is insufficient, which is detrimental to the overall structural stability of the cover plate structure and to improving the quality of the cover plate structure. Furthermore, when 'a' is too small, it is also easy to have incomplete welds, resulting in poor airtightness between the first base plate 21 and the first welded component 4. Electrolyte can enter the gap between the first base plate 21 and the first welded component 4, and the electrolyte can contact the aluminum part of the composite electrode post 2, causing local corrosion of the composite electrode post 2. This will further increase the problem of poor airtightness, and may even cause the composite electrode post 2 to loosen and the battery cell to be scrapped. If the weld penetration depth a between the first base plate 21 and the first welded part 4 is greater than 0.9 times the thickness e of the first welded part 4, then the weld penetration depth a is too large, and the welding process is prone to pores, which will also cause poor air tightness. Alternatively, the heat from welding may burn the first sealing ring 7, causing damage to the sealing ring and poor air tightness.

[0064] Optionally, when e is 2.5mm, the value of a ranges from 0.3mm to 2.25mm. Optionally, the value of a can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, or 2.25mm.

[0065] Optionally, the second welding component 5 has a fourth assembly hole 51, and the first part of the composite pole 2 passes through the fourth assembly hole 51 and is welded to the second welding component 5. The first part is the area of ​​the end of the composite pole 2 facing the outside of the cell.

[0066] Optionally, the first part has a first boss 22 protruding outward from the cell and a first annular end face 23 surrounding the first boss 22. The first annular end face 23 is disposed outward from the cell, and the first annular end face 23 is seam welded to the second welding member 5.

[0067] Optionally, since the weld mark of the first annular end face 23 and the second welded part 5 is located at the first annular end face 23, when the height of the first boss 22 is appropriate, the weld mark will not affect the welding of the end face of the first boss 22 facing the outside of the cell to the external connector, which can ensure the welding area of ​​the composite pole 2 to the external connector and ensure stable conduction with the outside.

[0068] Optionally, along the radial direction of the composite pole 2, the width of the first annular end face 23 is c, satisfying: 0.5mm≤c≤2mm. If the width c of the first annular end face 23 is less than 0.5mm, it is too small to accommodate the solder mark; if the width c of the first annular end face 23 is greater than 2mm, it is too large and wastes space in the width direction of the top cover 1.

[0069] Optionally, the value of c can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm.

[0070] Optionally, along the axial direction of the composite pole post 2, the height of the first boss 22 is d, satisfying: 0.2mm≤d≤1.5mm. If the height d of the first boss 22 is less than 0.2mm, it is too small to accommodate the solder mark; if the height d of the first boss 22 is greater than 1.5mm, it is too large and wastes space in the thickness direction of the top cover 1.

[0071] Optionally, the value of d can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm.

[0072] Optionally, along the axial direction of the composite pole 2, the weld penetration depth between the first annular end face 23 and the second welded part 5 is b, satisfying: 0.3mm ≤ b ≤ 2mm. If the weld penetration depth b between the first annular end face 23 and the second welded part 5 is less than 0.3mm, the value of b is too small, resulting in insufficient weld strength. Under long-term stress, it is prone to detachment, causing failure of the cover plate structure. If the weld penetration depth b between the first annular end face 23 and the second welded part 5 is greater than 2mm, the value of b is too large, and the weld is prone to pores, causing airtightness problems. Furthermore, the welding heat can easily burn the first upper plastic 9, causing local insulation failure.

[0073] Optionally, the value of b can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm.

[0074] Optionally, the first part and the second welded part 5 are made of the same material to further ensure the welding quality at this point. In this embodiment, both are made of aluminum.

[0075] Optionally, in this embodiment, the cross-section of the first protrusion 22 is circular, and the diameter of the cross-section of the first protrusion 22 is D, satisfying: 5mm ≤ D ≤ 30mm. If the value of D is less than 5mm, the end face dimension of the first protrusion 22 facing the outside of the cell is too small, and the welding area between the first protrusion 22 and the external connector is too small, which is not conducive to welding operation and to ensuring welding strength. If the value of D is greater than 30mm, the composite pole 2 is too thick, increasing the cost and constituting design redundancy.

[0076] Optionally, the value of D can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, or 30mm.

[0077] In this embodiment, the main body of the composite pole 2 is a cylindrical structure, and the cross-sections of the first protrusion 22 and the first base plate 21 are also circular. Of course, in other embodiments, the cross-sections of the main body of the composite pole 2, the first protrusion 22, or the first base plate 21 may also be elliptical or polygonal, and this is not a limitation.

[0078] Optionally, the composite electrode 2 includes a second part 201 and a third part 202 connected together. The second part 201 is made of aluminum, and the third part 202 is made of copper. The main body of the composite electrode 2 includes a first main body and a second main body. Optionally, the second part 201 includes the aforementioned first part and the first main body of the composite electrode 2, and the third part 202 includes the first base plate 21 and the second main body of the composite electrode 2. Optionally, the composite electrode 2 only includes the second part 201 and the third part 202, therefore V2 / (V1+V2) is the volume percentage of the third part 202.

[0079] Optionally, the volume of the second part 201 is V1, and the volume of the third part 202 is V2, satisfying: 0.1≤V2 / (V1+V2)≤0.5. The forming process of the composite pole 2 includes: pouring liquid aluminum onto a solid copper plate, then rolling it with rolls to form a composite plate of uniform thickness, and then processing the composite plate into the shape of the composite pole 2. During the forming process of the composite plate, if the thickness of the copper plate is too large, that is, the proportion of the third part 202 is greater than 50%, the temperature field uniformity of the aluminum liquid on the copper plate is poor, and the bonding strength between copper and aluminum in the composite plate is poor. Similarly, if the thickness of the copper plate is too small, that is, the proportion of the third part 202 is less than 10%, the temperature field uniformity of the aluminum liquid on the copper plate will also be poor. Therefore, for the composite pole 2, the proportion of the third part 202 of copper material is generally between 10% and 50%.

[0080] Optionally, V2 / (V1+V2) can take the value of 0.1, 0.2, 0.3, 0.4 or 0.5.

[0081] Optionally, in this embodiment, the composite electrode post 2, the first welded component 4, the second welded component 5, the first sealing ring 7, and the first upper plastic 9 are all disposed on the negative electrode.

[0082] Optionally, in this embodiment, the cover plate structure further includes a second pole post 3 and a third welding component 6. The second pole post 3 has a second base plate located inside the top cover 1, and the third welding component 6 is located outside the top cover 1. The positive pole post is welded to the third welding component 6.

[0083] Optionally, the insulating sealing assembly includes a second upper plastic 10, which is partially sandwiched between the third welded part 6 and the top cover 1. The second upper plastic 10 has a side to wrap around the side wall of the third welded part 6, and the second upper plastic 10 also has a protruding ring protruding towards the inside of the cell. The second pole post 3 is partially inserted into the sixth mounting hole of the top cover 1, and the protruding ring is inserted into the sixth mounting hole to be sandwiched between the inner wall of the sixth mounting hole of the top cover 1 and the second pole post 3, thereby ensuring insulation between the second pole post 3 and the top cover 1.

[0084] Optionally, the insulating sealing assembly further includes a second sealing ring 11, which is sleeved on the second electrode post 3. A portion of the second sealing ring 11 is located within the through-hole of the lower plastic 8. The protruding ring of the second upper plastic 10 abuts against the portion of the second sealing ring 11 that protrudes outward from the battery cell. This protruding portion of the second sealing ring 11 can seal the gap between the protruding ring and the second electrode post 3, thereby improving the sealing performance of the cover structure. The end face of the second sealing ring 11 facing inward from the battery cell abuts against the second base plate of the second electrode post 3. A portion of the second sealing ring 11 is sandwiched between the second base plate of the second electrode post 3 and the top cover 1 to ensure sealing at this location.

[0085] Optionally, the second electrode 3 is a positive electrode, and the positive electrode is made of aluminum. Optionally, the shape and size characteristics of the third welded part 6 are consistent with those of the second welded part 5.

[0086] Optionally, the third welding part 6 has a fifth mounting hole, and the fourth part of the second pole post 3 passes through the fifth mounting hole and is welded to the third welding part 6. The fourth part is the area of ​​the end of the second pole post 3 facing the outside of the cell.

[0087] Optionally, the fourth part has a second protrusion facing outward of the battery cell and a second annular end face surrounding the second protrusion, the second annular end face facing outward of the battery cell, and the second annular end face is seam welded to the third welding member 6.

[0088] Optionally, since the weld mark of the second annular end face and the third welding part 6 is located at the second annular end face, when the height of the second boss is appropriate, the weld mark will not affect the welding of the end face of the second boss facing the outside of the cell to the external connector, which can ensure the welding area of ​​the second pole post 3 to the external connector and ensure stable conduction with the outside.

[0089] Optionally, along the radial direction of the second pole post 3, the width of the second annular end face is f, satisfying: 0.5mm ≤ f ≤ 2mm. If the width f of the second annular end face is less than 0.5mm, it is too small to accommodate the solder mark; if the width f of the second annular end face is greater than 2mm, it is too large and wastes space in the width direction of the top cover 1.

[0090] Optionally, the value of f can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm.

[0091] Optionally, along the axial direction of the second pole post 3, the height of the second boss is g, satisfying: 0.2mm ≤ g ≤ 1.5mm. If the height g of the second boss is less than 0.2mm, it is too small to accommodate the solder mark; if the height g of the second boss is greater than 1.5mm, it is too large and wastes space in the thickness direction of the top cover 1.

[0092] Optionally, the value of g can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm.

[0093] Optionally, along the axial direction of the second pole post 3, the weld penetration depth between the second annular end face and the third welded part 6 is h, satisfying: 0.3mm ≤ h ≤ 2mm. If the weld penetration depth h between the second annular end face and the third welded part 6 is less than 0.3mm, the value of h is too small, resulting in insufficient weld strength. Under long-term stress, it is prone to detachment, and may even cause failure of the cover plate structure. If the weld penetration depth h between the second annular end face and the third welded part 6 is greater than 2mm, the value of h is too large, and the weld is prone to pores, causing airtightness problems. Furthermore, the welding heat can easily burn the second upper plastic 10, causing local insulation failure.

[0094] Optionally, the value of h can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm.

[0095] Optionally, the positive electrode post and the third weldment 6 are made of the same material to further ensure the welding quality at this point. In this embodiment, both are made of aluminum.

[0096] Optionally, in this embodiment, the cross-section of the second boss is circular, and the diameter of the cross-section of the second boss is I, satisfying: 5mm ≤ I ≤ 30mm. If the value of I is less than 5mm, the end face dimension of the second boss facing the outside of the cell is too small, and the welding area between the second boss and the external connector is too small, which is not conducive to welding operation and to ensuring welding strength. If the value of I is greater than 30mm, the second electrode post 3 is too thick, increasing the cost and constituting design redundancy.

[0097] Optionally, the value of I can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, or 30mm.

[0098] In this embodiment, the main body of the second pole post 3 is a cylindrical structure, and the cross-sections of the second boss and the second base plate are also circular. Of course, in other embodiments, the cross-sections of the main body of the second pole post 3, the second boss, or the second base plate may also be elliptical or polygonal, and this is not a limitation.

[0099] This embodiment also provides a battery cell, including a housing and the aforementioned cover structure, the cover structure being disposed over the opening of the housing. This battery cell can help ensure the positional fixation of the insulating sealing assembly while also reducing the processing cost of the composite electrode 2, thus improving economic efficiency.

[0100] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A cover plate structure, characterized in that, include: Top cover (1), the top cover (1) is provided with a first assembly hole (101); Composite pole (2), wherein the composite pole (2) is partially inserted into the first assembly hole (101); An insulating sealing assembly is provided with a second mounting hole, and the composite pole (2) is partially inserted into the second mounting hole; The first welded part (4) is located on the side of the top cover (1) facing the inside of the cell. The composite pole (2) is welded to the first welded part (4). The insulating sealing assembly is partially sandwiched between the first welded part (4) and the top cover (1). The second welded component (5) is located on the side of the top cover (1) facing the outside of the cell, and the composite pole (2) is welded to the second welded component (5).

2. The cover plate structure according to claim 1, characterized in that, The composite pole (2) has a first base plate (21), and the first welded part (4) has a receiving groove on its end face facing the inside of the cell. The bottom of the receiving groove has a third assembly hole (41). The first base plate (21) is located in the receiving groove, and the composite pole (2) passes through the third assembly hole (41).

3. The cover plate structure according to claim 2, characterized in that, The first base plate (21) is welded to the first welded part (4). Along the axial direction of the composite pole (2), the weld penetration depth of the first base plate (21) and the first welded part (4) is a. Along the axial direction of the composite pole (2), the thickness of the first welded part (4) is e, satisfying: 0.3mm≤a≤0.9e.

4. The cover plate structure according to claim 2, characterized in that, The end face of the first welded part (4) facing the inside of the cell is flush with the end face of the first base plate (21) facing the inside of the cell; And / or, the first welded part (4) is made of the same material as the first base plate (21).

5. The cover plate structure according to any one of claims 1-4, characterized in that, The second welded part (5) has a fourth assembly hole (51), and the first part of the composite pole (2) passes through the fourth assembly hole (51) and is welded to the second welded part (5).

6. The cover plate structure according to claim 5, characterized in that, The first part has a first boss (22) protruding outward from the cell and a first annular end face (23) surrounding the first boss (22). The first annular end face (23) is disposed outward from the cell and is seam welded to the second weldment (5).

7. The cover plate structure according to claim 6, characterized in that, Along the radial direction of the composite pole (2), the width of the first annular end face (23) is c, which satisfies: 0.5mm≤c≤2mm; And / or, along the axial direction of the composite pole (2), the height of the first boss (22) is d, satisfying: 0.2mm≤d≤1.5mm; And / or, along the axial direction of the composite pole (2), the welding penetration depth between the first annular end face (23) and the second weldment (5) is b, satisfying: 0.3mm≤b≤2mm; And / or, the cross-section of the first boss (22) is circular, and the diameter of the cross-section of the first boss (22) is D, satisfying: 5mm≤D≤30mm; And / or, the first part is made of the same material as the second welded part (5).

8. The cover plate structure according to claim 6, characterized in that, The composite pole (2) has a first protrusion (22) protruding from the outside of the cell at one end, and the end face of the first protrusion (22) facing the outside of the cell is welded to the external connector. And / or, the composite pole (2) has a first base plate (21) at one end inside the cell, and the end face of the first base plate (21) facing inside the cell is welded to the tab of the pole group or the internal connector.

9. The cover plate structure according to any one of claims 1-4, characterized in that, The composite pole (2) includes a second part (201) and a third part (202) connected to each other. The second part (201) is made of aluminum and the third part (202) is made of copper. The volume of the second part (201) is V1 and the volume of the third part (202) is V2, satisfying: 0.1≤V2 / (V1+V2)≤0.

5.

10. A battery cell, characterized in that, It includes a housing and a cover structure as described in any one of claims 1-9, the cover structure covering the opening of the housing.

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